Trust me, even if you have a creative hobby all of the time your are doing that hobby, you'd still feel just as crap as if you were playing videogames nonstop since either way you aren't really taking control of your life in the way that would bring you true fulfillment.
This also isn't to say that if you had a job, a car, a house, a partner or whatever else that you have been lead to believe would be able to achieve this fulfillment itself.
Even if you possessed all of these things, the majority of the most important elements of your life are dictated instead by the capitalists and the technology they control.
You as an individual cannot control whether you can keep your job, your benefits, etc. You don't get to control whether your country does or doesn't fight a war half way across the world, if we will do enough (or anything at all) to stop ecocide or even just keeping kids from starving in the streets while high on smack.
Even if you attempted to take control of your own immediate actions in typical liberal fashion, you'd quickly find yourself frustrated by all the laws and regulations that inhibit your every move and serve only those at the top.
Your sentiment about the futility of activism too, is totally valid.
Activism cannot and will not solve any of the problems we currently face as a species.
Only class consciousness can orient the mass of people needed to counter the capitalist's absolute control and a bunch of middle-class 50-somethings parading around in a circle with performance art will not achieve that.
Unfortunately, in the UK (and most of the post-industrial world) this general class consciousness isn't here yet for a multitude of reasons. The level of consciousness necessary to affect serious change also cannot be brought about by any one working class individual's actions; only a dramatic decrease in the quality of life is proven to awaken said required level.
In a morbid twist of fate, ecocide will most probably cause such a dramatic decrease (see my post here for more on this https://bunkerchan.xyz/leftypol/res/274553.html#q279790
) and make revolution possible.
Until then… no-one on the left really knows what to do.
For me, I try to read as much theory on leftism as I can (although modern media has ruined my attention span and makes extended reading difficult) and treat everyone I meet or even pass by well, everyone deserves a smile.
I also am attempting to get an easy job near me to save up funds and volunteer at local outreach and church orgs to meet new people and help the people that are here now.
Do any of those things directly contribute to revolution in a meaningful way?
I don't think so.
But there really isn't much else to in regards to leftist revolutionary activity in the modern day.
I'd readily fight porky soldiers out in the jungle if the conditions here today were comparable to the Cuban revolution, but they aren't.
Apologies for not having any actionable point here, but the fact is that as a working class individual, there really isn't much you can do right now.
Try to seek out any leftist groups in the UK, national then local (if only to talk about these things in confidence), join a local outreach group or community org to meet new people and help them, join or make a good militant union when you can and organize and advertise your own lefty book club to find people who care where you are.
That's all I can see to do considering you and I are in the Imperial core of the world, under constant surveillance and with no real resources on hand.
Hopefully you can find some worth in this.
I wish you well, comrade.