Well what exactly is your problem? Are you having a problem with grammar, vocab, or kanji?
I’d imagine it’d be all 3 after textfugu because it really doesn’t take you that far. You’re not really going to find a one stop place to learn Japanese so you need to supplement everything you do with something else.

For grammar You can go the textbook route (Genki1/2 and Toriba/An integrated approach to intermediate Japanese) Or Tae Kim.

For Kanji you can do remembering the kanji or Wanikani (I personally use wanikani so i’d recommend that one more but i’m biased :p)

For vocab you should do core 2k/6k

Just did Season 2 chapter 8. Going to do Season 2 chapter 9 aka “Counting and Numbers”.