Plenty of alternatives to GA
* Self-hosted client-side analysis like Matomo (will miss some people who block such things, but otherwise interesting).
* Server-side log analysis like AWstats (can't tell you about client-side stuff, but logs every request).
* Custom server-side activity logging (customised to tell you what you want to know).
* Relax, talk to your customers, etc. Analytics can't tell you everything.