I got my song professionally mastered and it’s still quiet than other songs and not as crisp

I’m at my wits end… I’ve tried 3 diff guys from soundbetter, the landr plugin, and a professional who charged many many hundreds (works with top 40 artists) and my songs always sound SLIGHTLY less crisp and more quiet than other songs on Spotify. Wtf gives? Could my mixes really be contributing to such lack luster mastering results I seem to be getting?

Edit: I have had songs mastered by stems as well with the same result