Joemy

So I'm running 1 stick of 8 GB ddr4 2.4GHz ram and a Ryzen 3 1200 I'm getting an RX 590 tomorrow (Right now I have a Gtx 1050ti as the GPU) and am trying to figure out what I should upgrade next. I know my CPU is old and I should probably get a new one but would it be better to get another stick of ram so it can run in dual channel. I only ask because I use this PC for gaming and have noticed that usually my CPU usage while using just discord and the game is 99%.