I very much relate.
I tried learning the Dave Matthews song “If Only”, after my wife said my buddy Mike and I should include it in our set. I was all over YouTube. I then tried to figure out an arrangement that would sound rich and full with simply two acoustic guitars, or a guitar and a mandolin. I ended up adapting chords so that they would be simpler, using a capo... and I treally thought my arrangement would work.
Then I tried singing. Big mistake. The song is scrapped, and I wasted four days.
I guess I’d say don’t be afraid to use a capo, and create your own chords that get you 90% there... it’s worked for so many songs in our sets. Just not this one