You could have other, self-hosted services there. That's my setup: I have self hosted trilium and used to self host matrix. The personal nginx served website was just a cherry on top of the cake.
Wait, you’re self hosting multiple apps on one system, and not using K8?!? Your apps can’t autoscale or do blue/green upgrades or any of the cool stuff you are now mandated to do by the cargo cult. How do you sleep at night??
/s
This is ultimately what drives me insane about the tech sector: so many choices are trend based and cult like when any sort of technical discipline shouldn't be.