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If you don't want to pay for the Sync function, you can host your note vault on Dropbox, GoogleDrive or other cloud sync solution to keep your notes up-to-date on all your devices. Or, if you don't want to use 3rd-party cloud solutions, you can use Syncthing to do note syncing yourself. (Just remember, it's not a back-up solution, for that you'll need to set up a separate workflow).
For personal note-taking, I would also recommend Obsidian - the base application without plug-ins already offers great functionality for creating 'second brain', but once you start adding some community plug-ins, the possibilities of its application are endless. You'll also find plenty of YT videos helping you get started. And the community is great.
I think we've got a misunderstanding here. Text files (in this case in orgdown syntax format) are files that contain the information in its original form: characters, words, sentences. So you only need a software that lets you open a text file to view it. If you want to modify the information stored in the text files, you need an application that lets you modify text files. In case of orgdown, you can find options on https://gitlab.com/publicvoit/orgdown/-/blob/master/doc/Tool-Support.org or choose any non-syntax-specific editor of your choice.