Just want to note that if burns are now coming up for you, they are going to keep coming until you complete WK. You are going to need to readjust your expectations for reviews to match that.
I don’t know how you currently use WK so this may not be helpful, but I would highly recommend trying to set a schedule for when you study on WK and make it a habit. check out this guide from @jprspereira, particularly sections 4-6 if you haven’t before. Learning how to most effectively use my time made a big difference for me personally.
Perseverance is also a big deal here. Sometimes studying kanji just isn’t fun or is actually a negative experience. I’m sure everyone here can remember one of those days where their reviews went terribly and it made them feel awful about their studying. Just remember that mistakes are part of the process. 頑張るよ！I’ve also found for me personally that if I’ve had a long day at work, or just don’t feel super into studying that it is more beneficial for me to skip a review session and mentally reset than it is try to continuously push through and risk a complete burnout. My next session in the morning is always way longer, but I also usually feel much better mentally so I’m up for the extra challenge.
Final thought, many people in this thread have mentioned to consider why you got into studying in the first place and use that to re-motivate yourself. I would offer that having considered that many times I’m sure, you should also think about whether or not studying on WK, studying Kanji, and studying Japanese are actually fun/enjoyable for you. Unless you need to learn the language for a job or some similar circumstance, you don’t need to do this if it is become a negative experience. It is completely possible to enjoy anime, games and Japanese music without speaking any Japanese, so if your motivations are more hobby based you don’t need to force yourself. This isn’t me saying that you should quit, but that it is a valid option and not one to feel ashamed about.
If however the idea of quitting makes you angry then you probably have it in you to keep going 
best of luck Kazekaitou