For personal or family, I think Fastmail is fine. I use it for a family account (paid years in advance), and admin other Fastmail tenants "family office" style for those who trust me to and offload the responsibility. I can get ahold of someone at Fastmail easily when issues crop up, which is rare. O365 is what I recommend for anything SMB and up. You can at least get support from Microsoft when needed. AWS is fine for cloud resources and infra, again, you can get support from a TAM or similar. But Google? I have never once had a good experience attempting to get in touch with a human when resolution is needed, hence my position on the topic. You cannot self serve critical business infra (imho), and Google is allergic to providing human support.

Buy your own domain and run mox (https://github.com/mjl-/mox) on it. In the setup it provides details on the DKIM info you need to put into your DNS records. Get a PTR record from your ISP (if hosting at home); periodically check your blocking from spamhaus etc.

I run mine on a Pi4 no problem whatsoever, but I guess a VPS could also be used, although the scamalytics analysis will show it's a server or an IP shared with an anonymising VPN etc. if it's a shared IP on the host.

I have run my mail there for 10 years and it was smooth sailing. Until they've raised prices two-fold but I digress…

For me Migadu has been good