It's this one for me
Being long isn't the main problem
It's just too painful and I don't have mental capacity for it waaaah
https://www.mangago.me/read-manga/ouroboros_1/
I usually put summary of last chapter read on my personal comment section or review section (whatever it's called it's where you write a comment after choosing want to read, reading or already read so comment is right above the story's summary) after reading so when I come back I can read the summary and notes of what happened and continue from there.
With so many ongoing stories my brain can't keep up and I'm tired of re reading so I had to result to this
That's only for short waits though. If the ongoing story doesn't update for months or years then you'll have to re read
You ever just want to reread a manhwa that's so good but has way too many chapters