i tried that with trading some BTC and buying a crypto.com debit card (with admittedly some nice perks - since massively scaled back!!!) lets just say i am done with instant gratification as well as any delusions of becoming a crypto king!!!.
A global ETF (that trades in £ to keep it simple) within a stocks and shares ISA is recommended for investment beginners for a reason.
I've no regrets.. Despite a few worrying dips if I watch it on a daily basis, I'm noe making about £200 per month profit off of a 20k investment.
I'm now thinking next year I'm going to split my new isa allowance with £15K into my s&s isa and 5k into my cash ISA.
My stocks and shares ISA contains 2 ETFs, one 'all world' at about 60%
And a European ETF at about 40%.
My European ETF is considerably out performing my global one at the moment so I might favour putting more into Europe than 'all world' come next April, but I'll see how it goes.
The lines get blurred a bit between saving and investing, and investing in a global ETF is basically as safe as you can play it really, unless you invest in bonds as well as equities, such as a Vanguard life strategy 60/40 or whatever.
But that said, it sounds like you have most of your capital in very safe places anyway.. So to start out, 100% equities global ETF (within a S&S isa) I would say is the most sensible place to start.
Edit.. Don't fall into the trap of buying shares in individual companies, stick with a diverse ETF and you won't go far wrong.