If your wondering why all my one piece stories end so aburpty it's cause simply put if your emporeor level tbe timeskip and by exstension most of post timeskip doesn't happen.
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Rimuru arrived at whole cake island unknown to all but his crew the world has aready been fused with nullity.
"So you want to rule the world?" Rimuru said as the family eats lunch.
"Yes mama wants to rule the entire world!" A talking sun said.
"Very well I will support your goal as long as you promise me something." Rimuru said looking at big mom.
"and what's that." Big mom asked.
"The magic contient island is mine." Rimuru said.
"DEAL" big mom said without question.
"My ressources are yours then saya is a bit too young to marry tho" Rimuru said.
"I'm 10!" Saya said.
"That's fine" big mom said.
"Can I eat parts of the island now miss Lin Lin?" Saya raised her hand.
"Go right ahead child." Big mom said