Best way to make friends in late 20s?

I'm starting to really feel it because my best friend moved away and all my other friends are in the marriage + kids stage of life. I've tried Bumble BFF and I feel like no one is willing to move beyond "hey, how are you?". People are always suggesting classes, gym, etc but that costs too much and I'm not working atm unfortunately. I'd really appreciate some advice / ideas!