What do you do when you hit the wall with your practising, playing etc? Put the bass aside, do something different, have a break.... Do some theory.... Polish your bass...keep going but do something different? Grab a different book and play a different style? Is there ever a stage where you won't get through the wall, accept that or give up?
Me..I just do something different and go back to it at a later stage..... And keep going, sometimes with a swig of Jack :-)