I'm pretty sure Adobe Air is free. And Electron is only popular among developers, whereas Air is a runtime for end users. Not saying you should use Air, just that I think what you are building has been built before. I do applaud you for the work, though.
Congratulations on your release! With Adobe Air you could make executables with html/css/js (or flash). End users had to have the Adobe Air runtime installed to run the apps. Can you help understand if the concept you have here is much different than, or much the same as the Adobe Air concept?
RealTimeBoard recently did a name change to Miro. I did a search for "miro realtimeboard" and saw an ad that said "Miro, formerly Realtimeboard...". Also, check out their post about the name change: https://miro.com/blog/features/realtimeboard-is-now-miro/
I think a good way is to pick a framework or library and start building something that you would use for yourself. If you choose react then just start building and as you hit things you don't know how to do, refer back to the course or search the Internet for the solution. Just start building something.
https://nodejs.org/api/single-executable-applications.html