Regain the use of your old over-spammed email address by providing important senders with spam filter bypass codes. Everything else gets caught by the filter.
An email server/software that you can install on your own machine or use a 3rd party service that runs it for a monthly fee. You divert your old email address to that server. It takes care of spam filtering for you.
When you share your email address with someone, you also provide them with a pass-through code. They are instructed to include that code somewhere within the email (doesn't matter where). If the code is valid, their message gets through to your inbox.
The spam filter checks all incoming mail. If the code is included anywhere within it, the mail passes through to your inbox. Emails without a valid pass-through code are considered spam and you never see them.
You can generate different pass through codes whenever you need them.
You can make them temporary, so that they get revoked after some time. You would provide those to postal courier services, shops, etc.
If the codes get abused you can manually revoke them at anytime.
You can add a note that shows up with each code. This is useful so that you know whose code got stolen if it gets abused.
All emails that include an expired code get into your "expired code folder". This is almost spam, but you might periodically want to check the folder just in case something useful finds itself there.
You can manually grant or revoke specific sender email addresses or domains so that they bypass the spam filter without needing a code.