Happy you found something that works.
What works best for my personal email address is very aggressively unsubscribing from notifications and labeling spam as spam.
Now that I only rarely get emails, I can very easily keep up to date.
A 5 minute glance into my email app is enough to be up to date for the last 2-3 days. About once a week I might receive a mail that actually requires action or a response.
Work is different. But I guess I get paid at work, so I spend way more time on my work email. But I don't like automatically filing work email, because if someone mails me, I need to take notice and perhaps respond. ADHD helps me with a positive reputation that I respond quickly when I not busy.