I use my own version of inbox zero.

I manually archive emails I might need in the future (like rent payment confirmations, job position applications that got past the screening interview, official correspondence with local administrative bodies, and very few other things).

I keep things that need action or are ongoing in the inbox (like online orders until they arrive, event tickets).

I delete useless emails (newsletters, code confirmations, online order emails or event tickets once the order arrives or the event passed) possibly preceded by unsubscribing.

That’s it, I usually have 0 to 3 emails in my inbox. No plugins, no filters.