Help me pick: 3 micro-SaaS ideas for underserved niches — which would you pay for?

I'm an accountant exploring micro-SaaS and narrowed it to 3 ideas after researching pain points on Reddit and forums. Before I build anything, I want to validate which one people actually want.

All 3 target small operators who are currently stuck between expensive enterprise tools and messy spreadsheets:

1. SoloBid — Estimates & invoicing for one-person contractors ($19/mo)
ServiceTitan costs $1K+/mo. Jobber is $50-150. Solo electricians, plumbers, and handymen just want to send clean estimates from their phone and get paid. No crew management, no scheduling for 30 trucks.
https://taxsort-tools.pages.dev/solobid

2. RentReady — Rental tracking for small landlords with 1-10 units ($15/mo)
QuickBooks is overkill. Stessa is free but limited. Every landlord with a few units is doing rent tracking + expense logging in a spreadsheet that their accountant can't read. One-click Schedule E export.
https://taxsort-tools.pages.dev/rentready

3. CleanRoute — Route-optimized scheduling for solo cleaning businesses ($19/mo)
ZenMaid and Jobber are built for teams. Solo cleaners waste 45+ min/day on bad routes between clients. This optimizes daily routes and handles rebooking.
https://taxsort-tools.pages.dev/cleanroute

Each page has a signup form. Whichever gets the most interest in the next 2 weeks = the one I'll build first.

Would love your honest take — which one would you (or someone you know) actually pay for? Or am I way off on all 3?