My family bought internet from a small ISP nearby who had done the same thing. We paid ~$100/month for WISP access, with ~10% downtime, 500ms of latency (at lowest), and 500kb down. It was a nightmare, and my siblings performance in school started tanking as they couldn't access homework or lectures from home. We eventually switched to Starlink, which has been a 100x improvement, both literally and figuratively.

Please, nobody ever start your own ISP. It absolutely sucks to use your infrastructure.