What monetisation strategy worked best for your product and what totally flopped?

Monetisation is one of those things that looks simple on paper but gets messy in real life.

I'm curious - for those of you who’ve launched products (especially indie or early-stage), what monetisation model actually worked for you?

• Did you start freemium and regret it?

• For free trials, did you collect card details upfront or not?

• Did one-time payments convert better than expected?

• Was usage-based pricing a nightmare or a win?

• Any experiments with donations, paywalls, or upsells?

• Also, if you changed your model later, what pushed you to do that?

Looking to learn from real-world wins and the lessons learned the hard way. Feel free to link to your launch if it adds context.