Expand the volume and the filesystem. Haven’t we already discussed this, including links to documentation about expanding volumes and filesystems?
Maybe we should move past the “what else could I do other than the thing I need to do” and move on to what problems you’re having with doing what needs to be done? I can answer questions about technical problems, but conceptually you’re making up new problems to avoid the only reasonable solution and I don’t really think anyone benefits from that kind of talking around the problem.
Just do the thing. Ask questions about what you don’t understand about the thing. Don’t make up new things just because the thing seems intimidating.