Q.Can I Plant Raspberries Where Raspberries Have Grown Before?
They’ve been successful for 20 years but when I’ve tried to replace them they dont root and die.

Certified GKH Gardening Expert
There may be some soil pathogens left from the previous fruit. You can start a new plot or sterilize the existing soil. Adding compost will help, too.
https://www.gardeningknowhow.com/edible/fruits/raspberry/care-of-raspberry-plants.htm
https://www.gardeningknowhow.com/edible/fruits/raspberry/raspberry-mosaic-virus.htm
https://www.gardeningknowhow.com/edible/fruits/raspberry/when-to-feed-raspberries.htm
https://www.gardeningknowhow.com/edible/fruits/raspberry/raspberry-leaf-curl-disease.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sterilizing-soil.htm