nginx – Best Practice for multi-site webserver (VM)

Right now i have multiple Ubuntu VMs running. It just developed over time. I have some that run two sites with apache, singe site apache, single site nginx and multisite nginx. it was quite good to use portainer and nginx proxy manager.

I want to change this to one webserver which will run the websites. Since they are just project websites that run for about 2-4 years, this changes and wont use too much performance. Is there a better way to do this or is the way?

In future i would like to give everyone that wants a website some space, one ftp account. Its not a problem to share the same php version but also i would be the one that would update the website, keep track on the certificates and so on.

the goal is so make it easy for me to give someone webspace (for wordpress, self scripted sites …), and make maintenance easier for me.