There is plenty of proof for life after death.
There are even academics studying the topic.
I gave one link earlier but there are dozens of books with all kinds of evidence.
The topic has a bad reputation because of a history of con artists and charlatans—and they still are out there—but there is lots of solid research and data.
The spirit realm is a lot more sophisticated than the temporal.
One revived patient asked "Why is there a tongue depressor on top of the light fixture"? It turned out to be there, and nobody on staff knew about it beforehand.
She could relate these incidents for hours, and all first hand experiences.