Motivation is different for everyone. I get the impression that a lot of studyblrs study hard because they love using cute stationery, making pretty notes, and what have you. Some people love the act of studying itself. I, on the other hand, can confidently say that I hate school. I’m passionate about learning, to be sure— I love expanding my mind and holding discussions and coming to new conclusions. But when it comes to taking notes and memorizing vocabulary and filling out worksheets and preparing for tests, I’d rather be doing almost anything else. I personally study hard so I can leave my desk as soon as possible and start doing things I actually enjoy without having to worry about my grades. I see studying as a means to an end. I memorize vocabulary (which I hate) to read more literature (which I love). I study all the Revolutionary War battles (which bores me) to gain a better understanding of history and expand my worldview (which excites me). I push myself to get the best grades I can (which is sometimes painful) to set myself up for success in college, grad school, and beyond (which I really want).
But at the end of the day, although it’s good to be excited about school, motivation is too fleeting and unreliable to make you a good student. When things inevitably get tough, neither cute notebooks nor dreams of a college acceptance letter are going to keep you motivated enough to continue working. Motivation can be the push that gets you in the water, but only discipline, determination, and a strong work ethic will keep you swimming. I highly recommend this answered ask about discipline and forming habits that will stick.
I also want to mention that if you feel like the “spiraling down” may be caused by something bigger than a lack of motivation or discipline, it’s worth talking to your doctor to see if you have depression. People often dismiss symptoms of mental illness as signs of laziness, and that’s absolutely not true. Make sure to take good care of your mental health!