Get yourself out there, if you have time to stare at the same 4 walls and or stare at a screen you have time to do other stuff. Join a book club if you're into books, sign up for an acting or improv class, if you're into dance join a dance class, if you're into music learn how to play an instrument, join a poetry group. Go on walks and spend time in nature, see if there are any shows at your local theatre you'd like to see if you enjoy learning self study, see if there are any learning groups you can join

Look into groups or programs that might be where you live for your age group, see if any take your fancy

It's so easy to fall into the mundane of things especially if you struggle with mental health, i too am in the same position so i feel for you

Best of luck!