But there does seem to be a connection to the death of Luke and Palpatine’s reemergence. I guess after Luke died he felt there was nothing standing in his way.

Maybe a hypothetical crawl could mention how Luke’s sacrifice has ignited a spark of hope throughout the galaxy, but his death has encouraged an old enemy to finally reveal himself. Snoke was obsessed with finding Luke, so maybe Palpatine has really feared Luke finding him, so much so that he had used a puppet to do his bidding rather than himself.