My server is here. There's nothing really on it at the moment, but it exists.
I'm on neocities because I was looking for a small lo-fi community. Gemini and Gopher both fit that description and are well-suited to most of the content I produce.
There's a higher barrier to entry for these protocols, so the userbase tends to be more grown-up and techy. And because they're very simple, people must focus on primarily text-based content rather than style.
I looked around on both communities using http proxies. There are links to server lists/aggregators on both of these.
Gopher has been around since the 90s, and it shows. My experience was that it was difficult to find interesting content, and a lot of content was only interesting as a time capsule (game hint manuals from 1994). Most of it consisted of cryptically named files and directories, and search results were spammed up with a bunch of "gopherddit" links (i.e. a reddit proxy).
Gemini has only existed since some time in 2019. The community is very small and recent. The aggregators offered interesting content immediately. It does feel a bit more 'normie' than Gopher, with its focus on 'gemlogs' (blogs) and quite a few emojis used in posts, but overall it felt a lot more welcoming and fresh.
Also, just a pointless personal reason: I hate gophers.
I used Jetforce in Docker.
If you already have a domain etc, it's very easy to set up and start serving content.
I plan to at least mirror my text posts there. When there's some content I will get it added to server lists.