Do you have any suggestions on how to fix email?

From my perspective all attempts at fixing anything broke something for smaller senders. Today if you want to host a mail server you can set up everything correctly (SPF, DKIM, DMARC) and your email still lands in the spam folder because you have not enough reputation. There are whole IP address segments that a flat out prohibited from participating.

Email is designed to be a distributed system. That means new standards can not really be added without breaking most of the systems. We still don't have mandatory transport encryption. So I don't see how to fix anything but to improve spam filtering and accept that it will be imperfect.