I know monzo is looking to integrate with other investment opportunities through the marketplace in the future. I think one such partner could be RateSetter. I’ve been using them for about 3y now, they offer P2P loans to individuals and businesses, you can set the term of 1m, 1y or 5y and set your interest rate and now they’ve started offering an isa option too.
I’ve found that for me investing this way has consistently given me more interest than a typical savings account with a bank.
RateSetter has a provision fund instead of other forms of protection that’s worth reading into before signing up.
Here’s my referral link to their site if you’re interested, and at the moment if you put £1000 they give you £100