Hi Justin6ix,
It sounds like your Mail App is slow and you've tried removing and reading the account as well as Resetting Network Settings. We're glad you've joined us in Apple Support Communities, and we can provide some assistance.
It seems like you've tried some of these steps, but let's double-check them in If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open. The troubleshooting in it will commonly fix issues of the Mail App not working correctly on your iPhone.
If the issue remains, let's follow the advice About iOS performance on your iPhone, iPad, or iPod touch. The troubleshooting in this link has the most frequent solutions to slow performance issues with iOS or iPadOS devices.
If the issue remains after following those steps, let us know which steps you had a chance to try from the links above.
We hope that helps with your question and take care!