It is possible to find sociable things to do that are free or cheap, like going to art galleries or museums, or for a picnic in the park, hanging out with friends in their homes, or at local cafes and bars instead of heading into the city centre and paying a premium for more expensive drinks (because their rent is more expensive in the city centre and they pass the costs on to their customers) and for transport.
But it's also true that if your disposable income is greater you have more possibilities for socialising, going to the theatre or to concerts, going on day trips with friends, going out to dinner in restaurants, going to visit friends in other cities.
I lost touch with quite a lot of friends when I wasn't working, because my friends moved about a lot, moved to different cities and even to different countries (and I'd done that also). But when I was living on disability benefits due to a physical disability that prevented me from working, I realised that my friends were all visiting one another and staying in touch, but I couldn't afford to, so I kind of drifted away from them and lost some friends.
I think it's a good idea to Google and try to find free and cheap activities in your local area. Maybe there's a local amateur dramatics group you can join, or maybe if you're in receipt of benefits you get free or low cost subsidised access to further education courses, maybe you can learn a new language or improve one you learned at school, or take photography or flower arranging classes, or learn motor vehicle maintenance or cake decorating or something.
It can often be easier to socialise with people if there's a purpose for the gathering. Instead of meeting up in a coffee shop or bar and being a bit tongue-tied with strangers, fearing lulls in the conversation and not having anything to talk about and being scared of embarrassing silences, it relieves the pressure if you go to a class or activity, like going to the cinema with others, or paintballing, or visiting an exhibition at an art gallery, or attending classes in calligraphy, it gives you something to talk about.