>>33298750 (OP)I was also full shut-in years ago.
For me, it started off with night walks in the summer. Hearing all sorts of different sounds like owls and crickets, seeing all sorts of different things like how streets and buildings looked cooler at night and just random passer-bys, smelling all sorts of smells like whoever smoking weed in the distance and flowers blooming or even rotting garbage the night before garbage day.
It made me realize how much sensory deprivation and isolation I was going through just sitting in my room.
More importantly, I discovered how suddenly I wasn't constantly anxious and angry from interacting with anons or youtube comments online. Going for walks would just clear my head, eventually I started jogging as well, joined a gym, got a job, etc.
Mental health and physical health go hand in hand.