To avoid microplastics in my coffee I do pour over style brew. A couple big names are Chemex and Hario brewers and filters. You get one of those systems and then you're supposed to use a goose-neck kettle to properly control the flow rate.
I order a few pounds of organic roasted beans online and put most of it in the freezer (gotta get that free shipping!). If circumstances were right I'd order green beans and roast my own on demand.
How about those Keurig coffee pods though eh, those things must fill you with the maximal plastics per brew
Or buy a glass cold brewer. It's way less harsh on the stomach when prepared that way.