You'd probably struggle with learning anything working so many hours. You need more rest. Related brain training to complement leet code could help you, like me

You'd probably struggle with learning anything working so many hours. You need more rest. Related brain training to complement leet code could help you, like mental math. Get your diet and exercise on the right track, those are probably not great. If you're stressed try Ashwaghanda, but take it only when very stressed, not often, maybe once a month at most.