Any Tips for Focusing? I’m Desperate and my Brain is Failing Me

I can’t focus for shit right now but I have to because I’m freelancing and I need to self-motivate. I’m on like 20 mg of vyvanse but still feel like my brain is in a million places at once. I literally just need to finish this story because if I can’t do the work I’m hired for, they’re not going to accept more pitches from me and I’m fucked. Maybe I’m burnt out because I’m trying to balance too many gigs as a freelancer? Or maybe I’m not trying hard enough.

Please give me any tips you have to force yourself to finish tasks when your brain isn’t cooperating. Should I drink more coffee? Strap myself to my chair? Set my laptop to self-destruct if I don’t finish this thing? Give me any advice you have: hinged or unhinged