I tested Plausible a few months ago and couldn't get it up and running on my own server. The docs stated that self-hosting was possible but not supported at all. It was a real bummer, hope they worked on this in the last months.
How did you try to get it running? They have a docker-compose setup[1] that was super easy to use. It looks to be 5 months old so if you tried before then, good news, it's easy now!