Progression after level 19 stupid question
I have been playing this game since the end of May this year so not exactly new but far from seasoned. About 2 weeks ago I reached level 19 and I thought that was it, I still have some upgrades to do but council and training grounds are maxd. Or at least it says they are. I have just had a hunter level 20 jacket after a side mission. How do I progress above 19 without the training grounds. I have had much higherror level walkers so guessing there is a way.