Is your question “How to monetize an app” or “How to monetize a website”?
I’d Google it! To get ideas flowing. I don’t think your question is specific to Glide, it’s a general monetization problem, it’s been solved. Add “freemium” or “no ads” or “strategies 2021” as need be.
Probably too general for you and the post is getting old, but here was a list of general ideas on how to monetize Glide expertise.