I don’t think defunding the FBI is the answer, but do we really need 16 or 17 armed federal law enforcement agencies that do not cooperate with one another? Consolidate a few. Roll DHS, ATF and a few others into the FBI and stop the redundancy.
Even nominally making the FBI more powerful by rolling other agencies into it is a big mistake. It is throughly and irredeemably corrupt. Any reorganization should include eliminating or massively overhauling it