Sorry I don't know much of it maybe @Coinsreporter knows.

another one is https://stemstr.app. He should also start being active on nostr and promote weblinks there...

Another platform for artists and creators is https://creatr.nostr.wine kinda patron, where he can release special songs only for active contributors

I told him about wavlake. Are there others that you know of that are bitcoin focused?

Tell him to adopt wavelake and also other possible platforms.