I think there’s something to challenging yourself that works for competitive-type personalities. It’s why gamified ways to learn languages are so popular - kanji would probably not have become one of my favorite things to study without WaniKani making it fun and providing a game-like challenge.
But, like other people have mentioned, language learning in itself is a long journey, and mastering grammar will take more than going through all the stages of an SRS program. Supplementing study with reading, output, and various native materials is essential, and with only so much time in the day, it’s important to balance completing a fun self-imposed challenge with all the other aspects of learning Japanese. Even us competitive types can experience heavy burnout if we overload ourselves!
ദ്ദി ༎ຶ‿༎ຶ ) Best of luck!