What options do mid startups have with investors?… I will not promote

I have lots of experience designing apps. I have an idea for a product that should exist but my conservative back of the envelope math indicates that this could make several millions in the coming years but that it’s unlikely to reach unicorn status. I estimate an MVP is going to cost around 100k to build iOS and Android, and I think I’ll know pretty quickly if it’s going to get traction. I could pay for it myself but I have a family and I’d rather give up equity and reduce my financial risk. I think I could raise 1M on a 10M post fairly easily but what happens if this turns out to be a great lifestyle business and not venture scale? In that event can you just say to early investors I’ll pay you X% of the profits every year as if they’re a co owner? Could I pay them back a reasonable 3x return to buy back the equity? I’m fairly confident the idea will work and I know people who invest in startups are seeking 10-100x returns. But I’m curious if anyone has any real world insight as to what happens to those businesses caught in the middle. For the record there’s a chance this idea could be venture scale, but I put that at a 1-2% probably with more like a 40% probably it could just be a cash cow. I will not promote