Beautiful voice! enjoyed this a lot, also your guitar playing sounds good to me, but i think i get what you try to say. Certainly it comes a moment when after reaching a level of skill we feel like getting stuck, i think it all depends on the way you want to go musically talking, maybe looking for new strumming patterns or chords could help, or maybe learning the different scales? whatever makes you feel motivated about it is worth a try, greetings!