@animekek69
That sounds like a personal problem
But for real tho, i know the feeling.
I read quite alot of series so its easy to forget.
What i do when i see a new chapter of a serie i can't remember what it's about i look at the previous chapter before the new one, then if i can remember what it was about i read the new chapter .
But if i STILL have no idea what its about after re-reading the previous chapter i just mark the serie to be re-read or dropped depending on if i like what i saw / rememberd.
no point in reading a chapter if you dont know what happend.
then you just go thought the re-read and plan to read tag when you find that you want to read something new before looking for actually new mangas