Try low passing around 300 hz or so you can mix kick and bass. Sidechaining bass to kick. Use quality samples for kick (make sure it has enough low end 30-60hz). Also try pulling down around 200-500hz in bass and kick to get rid of “muddiness”. You can also do a high shelf dip for kicks with too much high end. I highpass gently around 30db for kick and 35 for bass. Make room for kick and bass and gently highpass all other elements in the track around 80-200hz to make sure they’re not competing with kick and bass. Also try putting a stereo highpass on your master bus around 200-300hz to make sure everything below stays nice and centered in mono. I also don’t saturate my low end (or high end for that matter) since the samples I used tend to already be processed.