Take a break. Do something else. Usually somehow the urge to read comes back the least you expect it. Worked with me can't guarantee it will for you.
My advice : don't force yourself to read if you don't have the desire or interest. that feeling can affect the experience of reading the story.
Ahah.. hah.. yes. I have the urge to like read 100 stories at once too but I know for sure I can’t handle that. What helps me with not adding new manga is staying away from the questions and keeping my tab on my homepage. When I get bored from the story and need a short break, I can like look around my homepage for a bit instead of going to the questions and adding even more. x_x I also organise the stories I really want to read into tags, makes it easier to find them back as well. Here are some examples if you want,
http://www.mangago.zone/people/tag/909794/Important/
http://www.mangago.zone/people/tag/909794/Recs%3A+BL/
http://www.mangago.zone/people/tag/909794/Recs%3A+GL/
Sometimes, I get super lazy to read yaoi or any kind of comic and my reading list keeps growing in everyday because of that. I see these wonderful BLs on Instagram, Tik Tok, etc that I add them every single time I see them but then I lose the urge to read. Does anybody experience something similar or it’s just me? Also, any tips on how to move on from readers’ block? Lol