Assalamu Alaikum - Can doing well make you lose motivation?

Assalamu Alaikum. This is what’s happening to me right now. I just received feedback on my first university report. It’s known to be really tough according to seniors, and I struggled a lot getting it done. I even had trouble meeting the deadline despite starting early - to be fair, most people in my year did. It’s been a month since I submitted it and I finally got my mark and comments from the professor. I got 82%. That seems like a good score, though I’m still unsure - I’m an international student here and I’m not fully sure what’s considered “good” in this system. Lots of people were complaining their grades were low and saying the professor was harsh. A friend said her marks were around 50%, and I heard last year the average was in the 50s as well. Now I have another report due in four days, and strangely I feel demotivated after seeing my grade and feedback. I think the result gave me some unfounded confidence that I’ll do well again, even though this new report is on a different topic and I don’t really know what to write. It doesn’t help that the semester is almost over and I’ve finished all other major assignments except this one. My brain feels content, but it really shouldn’t because this report will affect my final grade. Can anyone advise me how to handle this? Could this be burnout? I had a reputation in high school for procrastinating and leaving things to the last minute, so at university I’ve been trying to break that habit. I don’t want to get complacent and fall back into old ways. Please be honest - I need someone to jolt me a bit and make me nervous like I should be. Any other tips are welcome too. Also, I know this sounds weird, but could you give me a few compliments? I haven’t told anyone my grade because my friends are stressed about theirs and my family wouldn’t really understand what it means (I got 80+ on all my finals and my mother asked if that was good - she thought it was just okay). Sorry for turning this into a rant, but yeah - does anyone know how to get motivated again in my situation? JazakAllah khair for any help.