As an advise, I think in your argument you should be looking at what government stands to gain from the legalization of crypto for you to achieve your objective pretty fast because when it comes to something so fundamental, the art of negotiation have proven to be very effective where the parties involved see that they are gaining something and the recent release by the IRS concerning the tax of crypto can come in handy in your argument.

Another again you should consider in how to tackle questions about insecurity and illegality should some people decide that because of the anonymity that surrounds crypto, they can perpetuate illegal activities. You will need to argue that the transparency is something that can be used as an advantage to get those individuals.