22 year old, Need advice from a pro (I’m from the uk)

I am very new to trading 212, and have been investing for under a year, I have been putting in £200 to a pretty basic ETF portfolio. This money I’m saving I’m not looking to withdraw for about 30 years type beat. I have saved up around £3,500 in my trading 212 but I have saved around £10,000 in my cash ISA, but now I have got more comfortable with the idea of investing I want to just say “!@#$ it” and put it all into my stocks and shares, I know not all at once (dollar cost averaging) but is it smart just to dump all this into my stocks and shares account? I want those bigger gains with more money in there. Also I have saved £8000 into my lifetime ISA which I don’t regret but I can’t touch it until I want to buy a house, it’s earned about £2000 in interest so I don’t want to take it out (as you loose at the interest), however I’m not too interested in putting money into it now as I have this shiny new toy where I can earn 12% a year on stocks and shares. Let me know what you think. Also for reference I am 22 year old – I have low outgoings eg, cheap rent etc, and not a high salary. Let me know what you think!