I'm not sure what your essays or other assignments are about (and maybe they're just highkey boring idk). But for me (I also have severe executive dysfunction) I have to EXTREMELY care about whatever I'm writing/creating to even find an inkling of motivation. So I seek out cool shit to read, watch, listen to, or look at to motivate me to tell a story/make art/yada yada. (this is different from doomscrolling I swear). Seeing other people make cool stuff makes me want to make cool stuff!! Maybe this is where parallel play can be helpful too.
OR I get pissed off about something I care about. It's honestly about generating energy. I watched Drew Gooden's video about AI art and it got me so pissed off I finished a project I was procrastinating.
or also also. do some other activity/chore u on your to do list to get u into the ~grindset~
im sorry if this wasn't very helpful lol
