Eddie, I was like you going from the car to other devices trying to get my mix sounding good on everything. I mix with studio monitors, studio headphones and even IPhone ear buds to hear what it sounds like. But the one thing I found that has been working great for me is a iZotope Tonal Balance Control plug-in. It comes with Ozone 8 & Nuetron 2.
I have the advanced versions so I don't know if that is available as a single plug-in on not. There are tons of videos on youtube that show how this works. You might want to check it out.

Brian


BIAB 2024 Ultrapack- Studio One Pro 6.5 Windows 10