I did feel the same, and I think it was because I felt incredibly competitive and was going full speed mindlessly. I stopped (again), but after 1.5 years I came back after starting listening to some Japanese songs again and remembering how much I love this language.
You may want to try lower the pace for a bit and also maybe find something in Japanese that you want to watch/read/listen to? You may want to check out our book clubs too (and this is coming from a person who hasn’t read anything before for 5 years). This community and being in the same boat helped me this time to stay motivated and just overall happier.
I hope you can find that spark again!