Firstly, you'll see lots of forum posts about hitting level 60 in 1-2 years, this is very difficult unless you want to dedicate a substantial amount of time (hours) every day. A more realistic pace might be 4 years or so. Many of these speed runners skip the vocab, and/or use scripts (e.g. to allow undoing mistakes etc).
Secondly, it can be draining to know your reviews are always increasing. I recommend using vacation mode (which pauses everything) when things become too much.
Thirdly, I think you need to complement kanji learning with reading real-world material to make it properly stick. It's feels different recalling individual vocab/kanji compared to reading sentences.