Learning one language makes it easier to learn another, so dont worry about which one you start with. Basically the “language” or vocabulary changes, but the underlying “grammer” (as in noun, pronoun, subject, adjective, etc) is for the most part universal. Like knowing what a library, functuon, method, class, loop, variable, etc will be transferable.
For a project, I dont know what you do for work, but you mentioned vba macros in spreadsheet, so id recommend building off of that. As someone else with adhd, the more interested I am in something, the more motivated I am in pushing through roadblocks when its not instantly easy. So id recommend trying to automate some task you do manually for work, something you know a lot about and know what the inputs and outputs should look like, and write something for that.
It would be cool if there was a sort of linktr.ee for git hosting, so I could could search for a repo and it would tell me what platform its on, if there are any mirrors, etc.