No it's not too late but the grass may not be greener.
Finding someone to "take you on" would be hard. A kid just out of college with an NVQ would be fitter, and probably cheaper than you'd want to work for.
I knew a guy who was something in a bank, who took off doing bathrooms in his 30's after he'd done a couple DIY. He did very well, but got fed up with the customers. They're a pain. He was exrtremely well organised, neat and tidy, bought a nice clean van and looked very professional. He got stuck a couple of times but he knew a few people to call. He was charging £300 a day, a decade or two ago. He found a lot of snags with things that leak, don't work, aren't standard etc. I lknow he used this forum , many evenings - there's a lot here.
I know a Awffer who does kitchens very well, similar story. But really he needs the mates for the obvious trades. He could do Part P and a little of the gas stuff, but he's still need the basic qual which is the biggest.
Of course you can do up properties but everyone's at it. Most pay far too much. To make real money you need access to all the skilled people, including architects. You could work with a General Builder like that, to get experience.
Many try and fail. Not usually because of the job. but the constant having to find work, chase invoices, and all that.
If it hasn't changed, you can do "Part P" work as a sparky, but for the full gamut you need to to an apprenticeship.
Gas is harder than in the old days, You can do a course in a college for a few days, and do the assessment, often at the same place, but you'll have to blag your way past the experience requitement, it's chicken and egg. I vaguely remember they ask for 20 installations of cookers under someone registered before you start.
Gas plumbing needs analyser/sniffer etc which afaik cost about the same as the sparks kit - pscc, breakdown tester, rcd/pat tester etc. They need regular calibration, same as gas.
I'd look hard at aircon installation, cctv installation, alarms I know naff all about them but they can be much further away from diy. In some cases though people will still be looking up what they can buy the stuff for. You could work for a company there, of course. A good way to start.
How much do you want to earn?
Sparks gan use a couple of oiks to run cables, and get the income up. Plumbing not quite so easily.
Don't forget you will wear your body out rapidly. Not to be taken lightly. Plastering does that rather fast.
I do think in your situation, you might struggle to keep all the plates spinning while you're trying to earn enough.
Seriously, have a look at stock market trading. It's not for everyone but you can do it whenever you like. Once a day, once a week, or all day, or...
You have to find out what to do, first, then practice with a "paper money" account. There's no cleverness needed., just a list of things to do.
I started with 20k, lost a couple in the first couple of weeks, but was into 6 figures within a couple of months. Today was a strange day because of Trump/China, but it was about a 10% day. Sitting on the backside. Some days don't work, some are much better. It isn't hard, except psychologically. It feels strange. You look for good probabilities. It's nothing like betting on a horse or anything like that, you get to learn what will probably go one way or the other and go through the steps. It's almost mechanical, and you get to treat the numbers as just numbers. You need to learn a little but there's daily guidance on youtube.
No rocket science. We knew that India's war would stop, so bought ahead. Same with China tariffs. We knew Gold would be coming down as a result. Same with the coming inevitable move of money back into the USA when T has settled down. So the "slow " money makes a percent or so a day. That's quite a lot, in a year. Waiting for Japan to pop up, too. World affairs may be boring to you, so just treat it as data!.
I have thread in the hobbies section.
Don't believe me?
well as I'm typing, I'm using this...... click it.
That "long tail" at the bottom is a tell tale so I bought just above it, and as you can see, the rise is flattening out, so I just sold it.
(There were other indicators which agreed...)
Result:
2% in 40 minutes. See?
Building society interest is about 0.02% a day.
Even as a sideline it works, 2% a day is 172x in a year. 1.02^(52 x 5)
To repeat, you watch youtube and do what the geezer suggests.