Just scrolling and consuming content is very bad for body and mind. If you feel numb like this, try to find one or several forms of self-expression that works for you.
Can be drawing, dancing, singing, petting animals, programming, staring at trees, knitting, gardening, making memes, recording videos. And even better: you're permitted to do all of it badly and just enjoy yourself, no rules need to be followed.
Not necessarily. Lifting is great for depression but not all causes. Sometimes you have something else up there that needs fixed. Maybe it’s ptsd and you need therapy, maybe it’s a different kind of chemical imbalance, maybe it’s gender dysphoria, maybe it’s insufficient social fulfillment, etc. Keep lifting, but also start seeking new treatments with it.