> I tried to orient what would be an affordable, future-safe alternative, but I haven't found any.

I think it would be OneNote. But if you really wand to future proof your data, I think nothing beats using Obsidian on top of a bunch of folders in a cloud drive.

I am all-in on Apple and I replaced Evernote with iCloud Drive, Notebooks.app, Obsidian and EagleFiler all pointing to the same "vault" folder. While on mobile I just use the regular Files app to browse the iCloud Drive. It's much less convenient than just using Evernote, and that's exactly Evernote's greatness.