You are very welcome
I think the best way to avoid burning out is:
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Don’t mind the time: In the long term It’s the same if you reach level 60 in 1 or in 2 years.
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Establish a fixed amount of work: Expressed in time or number of reviews. That will prevent you to feel overwhelmed.
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Keep motivated!
Focus on your objective: ¿Why do U want to learn Japanese? Write it in a very visible place and read it every time you feel down.
Also consider joining some group!
May I recommend this one:
WaniKani Study Buddy Race - 2022, All Aboard!
There you will find very supportive buddies