I use an android app called kanji study to help learn/practice writing kanji. Once you have the basics down, writing characters helps a lot since it helps you recognize radicals that appear all the time (and helps a lot with remembering characters)

https://play.google.com/store/apps/details?id=com.mindtwisted.kanjistudy

If you’re serious about becoming fluent, apps will not give that to you. Ditch everything else and focus on input.

More here: https://refold.la/simplified/

I’m trying to use a combination of Genki and Renshuu, but learning this on your own is still incredibly rough.

I would recommend staying away from Duolingo, personally, because it not only heavily promotes memorization over understanding, but also often teaches you things completely wrong. This doesn’t apply to just Japanese, and it’s matching the experience of other people I’ve talked to