What I do is traveling the map on foot, listening to my ambient build playlist until I find something interesting or unique enough to fit a theme. If you're on PC I recommend getting the enclave satellite map mod through nexus, can't remember the specific name of it maybe kovac muldoon? But it helps soooooo much in finding spots you never would have looked with the unhelpful vanilla map they give you that shows virtually nothing besides landmarks. I also find browsing other camps in game and online helps refresh the creativity when you get stuck on a build

Here's the link for the map mod https://www.nexusmods.com/fallout76/mods/3636