Hi @hemanzur , your Fstab is well configured , so please follow this steps :
edit /etc/default/grub → Look for the GRUB_CMDLINE_LINUX line and ensure that it includes the resume parameter with the UUID of your swap partition .
→ something like this GRUB_CMDLINE_LINUX="resume=UUID=a97f3b45-3de3-4fee-bb58-2bb325bfbcaf"
→ after saving changes , sudo grub-mkconfig -o /boot/grub/grub.cfg
try hibernating your system again
→ and share the output of journalctl | grep -i hibernate