Getting the bass to sit in the mix with EQ and a little compression is the most important thing.
For additional help you may want to try out a little VST that someone on this forum YEARS ago enlightened us with, and I am still using - try BAXXPANDER for grins... When I can't get enough space to sit in, sometimes its because the bass isn't thick enough itself.
I use an older 1980 PBass, usually new strings, and run it through my old SWR 900. I take a direct out and mic one of the goliath III's 10's with a d112. MOST of the time, I choose the direct out (don't use the mic track at all), and add a little of this VST - and in its case, a little goes a LONG way.
Best regards,
L