Get out there as a 'mate' and start earning half decent money.
Level 2 and 3 at college is gonna cost you 2 years of your life (at least - when the pandemic hit some colleges were put back by 1 or 2 years and some even more - i know lads who started in 2017 and still haven't finished due to that and other problems with staffing, supplies, equipment etc.) and several thousand pounds. Then when you have level 2 and 3 you're not considered qualified by anyone and will be on mate's money anyway.
Then there's the fact that college doesn't actually teach you anything about being a real life spark and only teaches you book-electrics.
Personally i wouldn't go that route and would try to get into the industry another way.
If i were in your shoes i'd go get the BS7671 regs book, copy of the on-site guide and the 'guidance note 3' and go pass your 18th edition. Then get an ECS/CSCS card and the world will open up to you.