I agree. The sooner you learn about particles the better, just to let those concepts sink in. It takes some getting used to.
@Monsi_boy2 As for recommended things to do I’d suggest going with your own interests and preferences. Find something outside of WK that peaks your interest and have a go at it when you feel like you have time in-between reviews.
As you progress, I suggest taking on listening activities more directly in-between reviews (just not too early, you’ll need more vocabulary for that), as it takes time to build up your ability to parse Japanese from sound only. Listening is mostly about experience and there is only one way to get it - to listen.
There are several tips about resources around the forum for listening to Japanese, but also this thread:
Good luck with your studies! ^>^