Player growth

I'm in my third season and I don't see much growth in the AHL or NHL players... example: Taylor Makar promoted for half a season, last season, in NHL overall 76, finished the season and started the new one still at 76... I try to rotate all the lines... at the moment my AHL team has many young 18-22 year olds between 74 and 79 overall with some mature players. Advice?