I have a TLD that ends in .fyi and I self host. I pass 100% of the tools on mxtoolbox, yet email going to gmail and Google Workspaces or whatever it is sometime

I have a TLD that ends in .fyi and I self host. I pass 100% of the tools on mxtoolbox, yet email going to gmail and Google Workspaces or whatever it is sometimes never gets delivered. I can see it being accepted by Gmail but that's it. sounds like I need to make a google account just to use Google Postmaster tools? one reason I kind of think that Google has gotten to be way too big for its britches when it comes to email. It's frustrating. The answer I usually hear is "just use Gmail."