Come on 
How hard can it be to type that title into Google (or any privacy-oriented search engine, like duckduckgo) and see what happens?
I remember Matomo from times when it was named Piwik (or something like that) and it indeed tends to fill up lots of database space after some months or so. They introduced some kind of report plugin where all data was deleted except the ones to recreate a predefined report. But that is probably still overkilling for you.
Maybe the best, if you really only want to count page views, visitors and countries a simple web server log analysis like AWStats might do the trick. That, of course, depends on if you have these available. If you host on an online service that’s probably not the case.
If you want to pay monthly for a service there are some out there that let you self-host. Like Plausible, but I don’t know if it’s good.