@Laniakea Might I ask what risk there is in joining an alliance? It is literally no more than joining a community Discord server (or less Likely, a Line chat) once you have found a worthy alliance. It isn’t like they gain any in-game power over you. If it doesn’t work, pack up and leave.
But they can be a wondrous thing, as you can potentially gain access to the alliance recruitment server, they may have a low level training guild in-house that you can pick up recruits from, there are liable to be any number of Bots and information channels to provide all sorts of wonderful tools to make your jobs as officers easier.
There is literally no downside to it that I am aware of.
The external recruiting scene has always been much more vibrant than any of the in-game tools, and you (wether in alliance or not) should be leveraging as many of those as possible to your advantage if you are dedicated to maintaining a full guild (because recruitment at anything beyond the earliest of levels is an ever present challenge).