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I want to put my money somewhere and earn more than a bank/under my mattress.
But banks / mattress are (supposedly) the most secure options, which is why they give you the lowest returns. Anything with higher returns are more than likely going to be riskier investments. Sorry if that sounds reductive, but "stress free" and "earn more than a bank" are difficult to square.
You could get a better interest rate than a bog standard bank account by going the Regular Saver or Fixed-Term investment route, but then you lock up your money. If that's not a concern, then these seem like the most stress-free options.
Or buy BitCon, it's guaranteed to go up.
An IFA should pay for itself - but the trick is finding a good one. I’ve never got very far on that.