One very easy thing to do to improve the qualify of your mix is to add a high pass filter on non bass instruments.
In the presence of bass guitar, you can likely remove lower frequencies from all other instruments like acoustic guitar and even piano. Sometimes these lower frequencies from other instruments are not audible in isolation but when added together, it can muddy up the things you do want to hear in the lower frequencies like bass guitar and kick drum.
In the end, what matters is how an instrument sounds in the mix. A rhythm guitar with the low end cut a little, might not sound quite as good on it’s own, but blended with the bass guitar in the context of the mix, the song will likely sound better overall.
Here’s a short video demonstrating this from the “5 Minutes To A Better Mix Series” by “TheRecordingRevolution.com”