Speaking of self hosted analytics, I used to use Piwik and it was great. It's called Matomo now https://matomo.org/
(Both are GPLv3, so there's no licensing issue or anything; Just caught my eye.)
https://matomo.org/blog/2019/10/matomo-analytics-for-wordpre...
I recently actually started using matomo (away from google analytics)...So I'm curious why you seemed to no longer use it?? Is there something that i should be wary about now using matomo?
We're using it for a big variety of clients small to big and sure, it's less capable than Google Analytics, but then again – most of our clients are just interested in simple visitor statistics to validate certain assumptions, not whether or not James Doe's engagement with our site has been 4.32% better after his second Flat White at Starbucks.
When ever there's a viable alternative to a Google product – go for it. Matomo is 100% viable and I feel much better tracking (anonymous!) user-behavior this way.
I expect Matomo to be even better, after all this time.