How do you get better on bass?

[David Powell]

Daily rehearsal.

Learn in slow first. Speed it up to faster than you will play it, then slow it down.
Learn it with the bow first, even if it's a pizz part
Learn it with an alternate fingering.
Learn to make both fingerings sound the same
Learn it an octave higher / lower
Learn it backwards (read the score from end to beginning)

Then you know it backwards and forwards.

Play with other musicians as often as possible.

Slowly but surely, I'm getting better.