ProtonMail is another paid service/client combo that supports multiple labels like Gmail. It’s very privacy focused, and they have a suite of products.
When it looked like Gmail was going to start charging for the legacy GSuite that I use for my personal custom domain (see other thread in forum) I started building a list of features I wanted and providers. Never finished flushing it out completely as Google backed off charging, but I still have the same hesitations re using Gmail in general. Just not quite the same impetus to switch right now.