20.62Make it richer only after confirmation

Maybe recording actually uses:

Cmaj7 | E7/B | Am7 | A7 | Dm9 | G13 | Cmaj9

Your first pass might have found:

C | Am | Dm | G | C

That's not failure.

That's a successful harmonic reduction.

Then listen for the chromatic transitions and insert E7/A7.