Here is what can be done for this :
1) People should be made more aware for using crypto technology carefully and wisely so as to avoid scams.
2) There should be separate laws and departments to deal with crimes related to crypto.
i don't think we need a "separate law enforcement department" for dealing with cryptocurrency related crimes because these crimes aren't actually a different category of crimes!
for example hacking an exchange is a general crime called "hacking"!
or robbing someone's bitcoins at gunpoint is the general "armed robbery" crime.
so is everything else you can think of.