Governments and central banks do not like to lose seignorage

What economic policies do governments and central banks pursue if they want to retain seignorage ? Seignorage is currently mainly collected by banks, thanks to deposits; banks’ reserves at the central bank do not bring in seignorage , as they earn the short-term interest rate. Governments and central banks can then seek to bring money back into the central bank's balance sheet, and therefore develop central bank cryptocurrencies; Seignorage could be moved into private currencies (private cryptocurrencies), which would be very negative from the point of view of governments and central banks; it is therefore likely that the use of private currencies will be increasingly constrained by regulations.