The silly sounding answer is that you just have to try stuff. You won’t know what you’re into unless you go look for it.
I also suffer from looking at other people enjoying things and thinking “that’s great for them but I don’t do that stuff”. You’ll always have the time for indoor time wasting when the weather/budget/whatever is in the way.
It’s very easy to feel zero urgency to go out and do stuff and to look back and think “huh did I waste two months I don’t remember anything happening recently”. Just look up events and meetups and hobby clubs in your area, you can just check it out and leave without losing anything. Sadly corporate social media is where a lot of stuff gets posted, but you can find a lot of stuff just fine without an account.
You can also think of not just what the “event” is but also what kind of people you think would go. I’m not necessarily that interested in TTRPGs but I know those events would attract interesting people I have common interests with.
What were they making before this thing?