I get downvoted whenever I say this in any sub that isn’t specifically dedicated to language learning, so I assume this is an unpopular opinion.

There’s more to language than just words. You need to learn grammar. Duolingo doesn’t teach grammar. They did have some grammar hints for some languages a while ago, but I believe they did away with those too.

If you want some language learning related leisure activity, then sure. I like to do it too with no illusion I’m actually learning.

Grammar books are boring, I totally get it. But they are teaching you what you need to know.