Hi @JeZxLee,
a Quick search would have led you to:
- Manjaro KDE Plasma Suspend/Hibernate not working - #3 by Eswell
- Power management/Suspend and hibernate - ArchWiki
- https://unix.stackexchange.com/questions/659822/hibernate-not-working
You need swap space, IIRC at least as big as the amount of RAM you’ve got, so maybe start here: