Saturating low end

Saturating low end can give the psychoacoustic impression that the bass fundamental is loud, as demonstrated by the Missing fundamental effect. Sidechaining the bass fundamental keyed from the kick can be helpful to control the sub bass while keeping bass consistent (see Sidechaining kick and bass).¹

Using emphasis and de-emphasis EQ with a saturator between can be useful so you can get more saturation before the bass frequencies get so crushed (see Use EQ before saturation).¹

Parallel distortion can also be useful.¹ Waves’ RBass saturates just the low frequencies around the corner frequency. You can do something similar by adding a parallel LPF with some resonance, a saturator, and end it with a HPF to isolate those harmonics.²