Think of Japanese like a cube. In one dimension, you have speaking and listening. That’s the width of the cube. In another direction, there is grammar. That is the depth of the cube. Finally, you have the height of the cube, and that’s reading and kanji.
Your ability to use Japanese is based on all three dimensions. If you prioritize one dimension over all the others, you will make progress without increasing your ability to use Japanese.
BUT, and here is the big thing, you’re not hurting anything if you focus on one of these dimensions for a period of time. It may not be the quickest path between where you are now and your final language goals, but so what? No one ever said you had to take the quickest path. Better to take the path that appeals to you and keeps you motivated.
So I’d say, give yourself a little while to focus on WK. Then go back to Genki and see if some of that vocabulary is suddenly familiar. See if some of that grammar works better when you have new vocabulary items to put into it.
I’m assuming that you’re learning Japanese for fun as opposed to for school. If so, remember that you’re doing it for fun. So do what you enjoy!
(Standard disclaimer - These are my views. Other members’ views may vary.)