Back to basics

[dreemeternal]

Hello. I'm new to this forum. I've been recording at home for a few years now. I've been a musician for a long time, and my recordings of my music are very decent, both in writing, performing, and recording, BUT....
There seems to be an ingredient missing to approach professional quality of the recording itself.
I had a Grammy award nominee master a couple of my songs, and they sound better but not quite there yet. I hear tons of artists, on Soundcloud, for example; whose recordings sound excellent, and I refuse to think they all record in a professional studio. I have a fast Mac, pro tools, logic, Focusrite clarett 8pre.
I know it's a very general question, but I'm wondering if any of you with similar equipment are getting professional grade results. What am I doing wrong?
Thank you.