Welcome back home 
Bunpro for grammar - check their thread here.
Kitsun for SRSing outside of WK (think Anki but more user-friendly) - check their thread here.
The cool thing is that they are both developed by WK users.
From the forums, I advise you to check:
- My guide for Wanikani - where I explain what I learned by going through Wanikani and that I wish I had knew before.
- Beginner Japanese Book Club
- Intermediate Japanese Book Club
- Resources for Starting to Read Japanese Content