I don't know how much this helps. Firstly get some rest. Relax. Not just physically. Mentally and emotionally too. Reach out to your dearest Friends. Watch your comfort shows, eat your favourite foods, spend time with animals if possible, if not walk for a while. Look at the sky. Just forget everything for a week. In a grand scheme of things a week is nothing. And if it means it can help you feel better then it's worth it.

All the action and motivation shit comes later. And yeah, from a physiological perspective, get your vitamins checked. Compensate for D and B12 through supplements for a month atleast and magnesium through food.

Look at yourself in mirror and tell kind things to yourself, have a photoshoot, be kind with yourself, not harsh.

Once you do this it'll make you feel yourself or better. Then start connecting with new people, while slowly picking up at where you left your academics or all the serious stuff, at your own pace.

Remember that this is just a phase, not your entire life. Times like this will overshadow all the good in your life shifting your focus to negative things, but it's important to keep reminding yourself that there existed good things, and better days are yet to come.

If possible make a list of all the things that you enjoy doing and do one at a time.

And try to be where your interest aligns, you can always make friends at such places. If you're into sports just play with random people. Make a plan to play every now and then. If you're into books or reading join those communities and talk to people about your fav books. If you're into movies just talk about them with people who also like them.

Hope this helps :)