I've been experimenting with a few different email options, still relying heavily on my gmail account... but I can say, I'd look into a dedicated host running mailu which is pretty much a docker compose file and configuration that lets you spin up a mail server really quickly and relatively easily. You have to configure a bunch of DNS records accordingly but it tends to work well enough. I've had delivery issues with outlook.com email, but not hotmail or office465, and delivery to gmail has also worked without issue.

I need to get off my ass and just create an inbox on my mail server to use instead of the blind/wildcard mail forwarding I currently have. It was a useful feature before google domains set off, and I setup my domains on cloudflare for it, bit really should just self-host it all with a good hourly backup/rsync out.