Film & TV

Direction - Films, Movies, Short Films, TV Serials, Features, Advertisement/TV Commercials etc. is a profile with the Public Relation, Doordarshan/Prasar Bharti divisions of the government. There is a possibility to get employed with the Universities and Film Production related government Institutions as well. Media Studies institutions managed by the government shall also offer jobs to Directors and Makers and Faculty.
Direction shall also be an eligibility to take Part Time or Project Based Jobs with the Government. Generally, LONG TERM Projects are also like Jobs when one gets employed in the government.
For more read:
What are the government job opportunities after completing a course in videography? https://ask.shiksha.com/what-are-the-government-job-opportunities-after-completing-a-course-in-videography-qna-4393074
https://ask.shiksha.com/what-are-the-government-job-opportunities-after-completing-a-course-in-documentary-production-qna-4393111

Higher studies are for those who have time and want to excel in the academics of a particular subject.
If acting and modelling students delay the starting of work in the professional world, they will be late.
Refer the following answers:
https://ask.shiksha.com/should-i-opt-for-higher-studies-or-pursue-a-job-after-completing-a-course-in-cinematography-and-why-qna-4393442
https://ask.shiksha.com/should-i-opt-for-higher-studies-or-pursue-a-job-after-completing-a-course-in-performing-arts-theater-and-television-qna-4393498
https://ask.shiksha.com/should-i-opt-for-higher-studies-or-pursue-a-job-after-completing-a-course-in-public-relations-and-corporate-communication-qna-4393404
https://ask.shiksha.com/should-i-opt-for-higher-studies-or-pursue-a-job-after-completing-a-course-in-mass-communication-and-why-qna-4393425
https://ask.shiksha.com/should-i-opt-for-higher-studies-or-pursue-a-job-after-completing-a-course-in-advertising-management-and-public-qna-4393492

A course in direction cannot be done unless you do a Bachelor's Degree in the film making and production domain. It is made clear merely a certificate course cannot make someone a good editor to claim jobs at the best places.
I shall suggest that when a good job with growing possibilities is there one has to take up the assignment because mass media jobs are the best to do when they come to you. Once the hunt starts, it takes time.
Refer the related answers:
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-certificate-in-direction-for-better-career-prospects-qna-4392881
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-an-advanced-certificate-in-direction-for-better-career-prospects-qna-4393525

Cinematography scope: Media, especially the electronics media has become quite a vast domain of learning as well as jobs today. The considerations of abroad or national are gone because the digital revolution has trespassed the boundaries.
Cinematography has not just remained restricted to films and entertainment anymore. The scope of cinematography is quite big all around. There are projects that are done on a global level and even for a certificate course, the scope remains good. As cinematography is learning the camera its direction and uses, photography -still or motion - hence the career prospects are always there. The course can work winners for those who have been searching for an opportunity to learn the nuances of cinematography work. The certificate course, however, shall be done preferably from an acknowledged and recognised the place.
Film, TV and New Media Production - Overall, there is no difference in the domains mentioned.
As a Mass Communication Expert, I shall not appreciate the submission that each of these categories mentioned is different from each other, they complement each other.

Acting and anchoring can lead to a good profile in the government sector. We have seen that there are so many awareness programmes of the government where millions of people are engaged to spread a word about the policies as well as general well-being awareness. Theatre, till date is the best method and tool to do so. Hence, acting is in demand as a skill.
The government is finding it tough to reach the world without skilled professionals who make the best of communication. Persuasive and impressive communication skills are important and even the government has been making use of the best and creative+innovative people by hiring them as public relations officers for various departments. The hiring is not just restricted to the offering by the Information and Public Relation Department. Any ministry or department that is dealing with people, has a need for someone with a course in mass communication/theatre, etc. These jobs are offered for the role of actors with the cultural wing and have ample scope for the eligible people. A course as said in the question must be one that fulfils the hiring criteria.

Documentary production/cinematography is a specialisation domain, and there may be many things that you will need to keep learning along with the production learning.
The suggestions that I can make are:
1 A degree in a popular language that could be used in your work place
2 Content writing and proof reading
3. Web development and digital marketing
4. Music and sound mixing basics/audio production
5. Advertising and public relations management
The decision depends on how much time you get free from the work of learning documentary production. When you say that you are learning the production of documentary, I take it as a comprehensive work that is itself a time-taking thing and might not allow you to venture for more.
Read the related question which gives a similar solution:
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-certificate-course-in-radio-jockeying-for-better-career-prospects-qna-4393561