A bit of a plug, but I have written a small piece with some suggestions for services that could be used to hide and not share your main account as well as some pros and cons to them here - https://psyonik.tech/posts/keep-your-email-private/
TL;DR - Cloudflare email works great if you have your domain on Cloudflare, Firefox Relay is cheap and will work with emails up to 150KB and a number of email providers give you the ability to create aliases (Runbox allows up to 100 aliases).