Welcome to the forums! That's an awesome story--accidentally popping out 50k words is no mean feat. Sounds like you had a lovely time writing it, too; sometimes it feels like the characters do their own thing and the story writes itself, but that's definitely not a universal experience. Congrats on getting it finished, above all else! That's something else that doesn't always happen with fanfic, heh.
Unfortunately I don't think we have any other TCG fic specifically around here, but if there are genres you enjoy in non-fanfic reading, there might be something you'd enjoy that has similar elements. Regardless, I can't guarantee feedback, but I'll do my best to check your story out. You've got me intrigued!
Welcome again, and I hope you enjoy your time on Thousand Roads.