One you don’t wanna join ;) (Google). I’m still on the free tier of what’s now Workspace and intent to move, but I’m dreading the work that comes with it.
A year or so ago Google almost killed the free tier (look up gsuite legacy if you want to know more). Back then I prepared to move away and settled on Zoho as my replacement, but in the end Google responded to the community’s backlash and kept the free tier free for personal use (although there are some other restrictions put in place, so eventually a move is inevitable). Zoho might also give you the features you want.
Lemmy devs expressed in an AMA that Liberapay is the preferred method of donation.