I've been where you're at. What needs to happen is to kick yourself in the ass, put out your best map, point at it and say "you're done". Stop looking back - you've conquered that - push forward. Do this for a full sweep throughout the entirety of what you have planned and have a completed project this time next year.
You've learned all this project needs and relearning will only hold you back. You're good enough to finish Runic Cipher and you know it because you've established boundaries around your focus. You're gonna get this done.