Im sure there are threads about this on the board already.
Its hard to generalize about this because it always depends on the source material.
Use a high-pass to cut away as much bass as you can until you have the low-end the way you want it.
DO NOT DO THIS IN SOLO. Always listen to the full mix.
Listen to the bassguitar and bassdrum soloed together. Make sure they are tight and not fighting eachother.
One trick that sometimes work is to add a very subtle chorus to the bassguitar.
Adding some distortion to it is also sometimes just what the doctor ordered.
But as the saying goes, it always depends.
Sidechaining a comp on the bassguitar with the bassdrum is also worth checking into.
Havent tried that too much myself though.
Im still learning myself so Im interested in any tricks from other people too.
These days Im focusing on removing shit from tracks thats not needed and is just taking up sonic space.
Low-pass distorted guitars as low as maybe 14khz. I just lower it until it affects the sound and then nudge back until
its good. High-pass them guitars too.. Get rid of sub-freqs you just dont need..
Fuck man. If it doesnt do anything to your sound, get rid of it.
Now you should only do this in a properly treated room with quality monitors.
Otherwise you might be fooled into removing freqs that actually contribute to the sound you want.
Does this help? I dont know.. Im still learning too but I really do feel that the things I mentioned
has helped my mixes.