Glide Table Rows Intermittently Disappearing

Have you looked at the new plans? The current Maker plan allows for unlimited personal users and 25k rows. There are important differences though between Legacy Starter and the new Maker plans, so make sure you understand the differences before committing. The most obvious difference is the type of user that can sign in.

Other than that, your other option is to contact Glide Sales about a custom Enterprise plan.