I’ll add that instead of trying to reach some arbitrary level, you can just try once in a while.
If there’s something you want to read, you can often find samples either on amazon.jp or by googling its name + 立ち読み or 試し読み.
I did this for a bunch of manga when I started out, at the beginning it was just incomprehensible to me, but I checked back every month or so and suddenly よつばと was actually somewhat comprehensible, so I bought that. Quite a morale boost to see such clear evidence of your progress!
I second the graded readers as well, they were my stepping stone between short sample sentences and actual native materials.