We're both in a similar situation I think.
As mentioned, we are both 10 years too late but are far too stubborn to give up something we've sunk so much time and effort into. It's frustrating to think about how you could have got on in poker if you know what you do but it was 2005 again. Like you watch old EPTs or WSOP on Youtube and think "Jesus I would be printing money if I could go back in time".
We probably both have days where we think this is going to work out after all, and then we get cruelly reminded that poker is a massive soul crushing grind a lot of the time unless you're one of the super-elites.
I stopped having an interest in become a 'pro' a long time ago. You don't need to be the piss bottling, hoodie wearer with 3 monitors on the go to enjoy poker and make a few quid out of it.
If your BR is £500 per month, and it never increases much even if you win because you dip into it to pay for living expenses - then you need to find another source of income for a while. If only to keep you sane when someone gets there in a big pot against you and you don't feel you need to cash your remaining money off so you can eat more than instant noodles that month. Get away from poker for a couple of months, save a bit up, go out and explore. You might find that you prefer it this way.
When I got back into poker about 4 years ago, I was jobless with no real direction. Just split up with my girlfriend I was living with, and freshly moved to Bedford because I had nowhere to stay back in Cornwall and my family moved up here. I got ~£110 in jobseekers each fortnight. Saved up £300 of it and put it online, and then LOLpunted it because I hadn't played poker for 3 years and the 10NL crowd owned my soul $3 at a time. I developed an obsession with it as a way to get my mind of my shitty situation in general, and after getting a job a couple of months later I had a nice floating bankroll that I could replenish if I had a bad month. Because there was no real financial burden on me, I could experiment with different things in poker and not stress if it went badly.
About 3 months into that, I really wanted to do it for a living. Until I actually tried to. I had decent results, but it felt no more liberating or free than working a normal job. I used to see people on the tube in London with their suits and briefcases all miserable because they have to spend their lives in the corporate office bubble. I used to really look at them and think they were stupid, and that I've found the greatest life hack in the world in poker. 21 year old me thought he'd never be a suit with his head buried in paperwork from 9-5, and that it was the nut worst situation in life for anyone. I thought that until the 'grind' became a grind. Instead of being buried in paperwork, I'd be buried in hand histories all day. I'd go days without speaking to anyone, living off cheap energy drinks and Dominos pizza. Stuck deep for a fortnight before getting out of it and back to even. If those people on the tube saw me they'd be the ones laughing I reckon. I was free in the sense I didn't have to clock in and report to an overbearing, micromanaging boss, but the reality of it is I was stressed, not sleeping and neglecting myself so much for the poker dream that I was slowly going mad.
There are always going to be mutants in poker that show up on the EPT having just turned 18 and seem to win the world within 6 months, and it's tough not to compare yourself to them and get a bit down about it because you've been at it for a while with bugger all to show for it except GoldStar and 15000 Starscoins.
It's easy to tell you to get a job and take some time off, but if you're anything like me in 2012 then taking time off would make you feel like you're drifting further and further away from what you want. I think it might be what you need though. Some steady income, something else to focus on for a few hours a day.
If you're as like minded as me as I think you are, then I think it could be just what you need.