Hello!
I'm sorry you find yourself with the bad feel that your game will get stuck to the Windows OS, but as others told you, trying to reconvert to a complete new and different engine is actually having to remake the game. I checked your game page and trailer and I must say that I find it very detailed: you have story, characters, maps, sprites and art, music, script events, ...
I tried years ago to play with RPGMaker2003 (it was 2004... yep, some years ago), and at least I remember how easy was to start prototyping (making characters, set them a few lines of dialog, a few maps...). But yes, on Unity you have to make a good bunch of tools and stuff by yourself first.
Getting it short... I wanted to help and found this:
https://store.steampowered.com/app/363890/RPG_Maker_MV/
RPGMaker MV allows you to convert the project to MacOS, Linux, Android,...
But you are using RPGMAker VX Ace,
So I tried to find a converter:
https://forums.rpgmakerweb.com/index.php?threads/vx-ace-to-mv-converter.45296/
No idea if you tried this already, but I thought that, maybe, if everything goes well, that could help you achieve to publish your game in more platforms.Good luck!!
And Merry Christmas!!!