I need help transferring progress.

Hey everyone, I wanted to share my problem and see if anyone can help me. My main Rainbow Six Siege account is on my Xbox, which is where I originally bought the game. Then, when I got a PC, I bought the game on Steam and have another account there. Now, I want to transfer my levels and characters from my main Xbox account to my PC, but I've watched videos and I just can't seem to do it 😅.