I need help with mixing and mastering

There are a few songs that the production is done that I would like help with mixing, I’ve tried to do a little mixing myself but have not been able to get as full of a sound as I would like, the low end seems a little muddy and I’m having hard time having the song translate well to other sources like my car, the genre is indie pop/ indie rock, some inspirations are Djo, Chappell Roan, The 1975 and others

Additional info:
I need the mixer to do some editing, time aligning and vocal tuning before mixing. . I'll need you to master it too if possible. I'm an indie artist. I'm interested in working with a very experienced mixer. I don't have a hard deadline for this. The song has somewhere between 10 and 30 tracks recorded that need mixing.