You have completed your Diploma in food technology with 80% and have a internship also.
You can opt for B.Tech in Food technology.
Food Industry is a rapid expanding filed with a wide range of choices and options for candidates. You have food processing, inspection, quality control and regulation, research in innovative packing and preservation, food chain logistics, consultant in perishable fruits and vegetable sector related storage, exports, packaging etc. You will have options in the vegetable and grains, poultry, meat and fish/sea food, the dairy and the baking sectors. So, you have a range of options based on your core skills, aptitude and what you have learnt so far in the diploma and the internship.
First, I would suggest you to stop worrying, make a list of your passionate topics in the food industry, your strengths and the areas you need improvement on. The meet informally with your teachers and the seniors where you did your internship. Gather some insight regarding how they find you in the food industry in terms of knowledge and the sub-sectors that you can do well in.
Then you have two options
If you need to start earning soon, then try for jobs with the Diploma you have, build your network of contacts from your teachers and importantly the internship place and people who can help you. You will always not find people readily to help you or come to you. You need to have a positive attitude, sincere approach and knock on many doors till you get the first opening.
Register yourself in naukri.com linked.in,jobisjob.co.in. There are sites for freshers that you cna chekc too (https://www.freshersworld.com/food-technology-jobs/2222169).
Once you get your first job, then you can focus on enrolling for a distance program under IGNOU.
IGNOU has PG diploma in Food safety & quality managment (PGDFSQM), Plantation Management. It also has a Diploma in Fish technology, meat technology, dairy, etc. Then you can progress up in your professional career based on what new otpions come your way.
If you can afford a few more years of education before getting a job, then you can choose a B.Tech in food technology and complete the course
MIT College of food technology offers many courses inducing B.TEch (http://www.mituniversity.edu.in/Academics/MIT_College_of_Food_Technology/)
Shivaji University,Vidyanagar, Kolhapur - 416004, offers B.TEch in food technology.
Jaipur National University has a B.Tech in food tehcnology.
Once you do this then you can apply for the jobs like we discussed earlier and move on with your career.
These are few websites that give you an idea about India's potential in the food and food oprcessig industry.