Is Duolingo just buns, or is it my fault?

I’ve been learning Japanese for three years on Duolingo and I have an impressive 1124 day streak. I’ve used other apps, watched sub anime, watch Japanese videos before, but my main one was Duolingo. The problem is that I’m still not very fluent after 3 years. I can recognize some words, I’m fluent in hiragana, katakana, and I understand some kanji.

I think a big criticism of Duolingo as well, is that eventually it makes you stop caring about the language as much as the streak which is probably what’s happening. Sometimes I’ll do a lesson where I learn a few new words, but I mostly just redo hiragana, katakana, or kanji lessons that I’ve already mastered since I’m lazy. I think it is my fault a little bit now that I think about it, but surely there are more effective ways to learn the language for sure.

ありがとうございます！