Do you honestly think your current subscribers will enjoy cryptocurrency news?
No, I doubt most of them will even know what it is. However, most of my subscribers are not there for me or my content, if I happen to be reacting to some videos they find interesting, they might watch.
I guess it would be better then to start over again with 0 subs, but reading your OP, i don't think your current ""viewers"" are going to support this change en masse..
But, as you are already kind of established with your 25k subs, it could indeed be that people would View/Subscribe faster then if you were to start over, with a new channel that would be dedicated to specifically crypto.
It's not like all of your current subscribers will somehow instantly unsub, but i would suspect that some of them will.
In all honesty, there aren't that many people out there that watch videos on youtube on how crypto works.
Unless you would be able to plug your content to reddit/r/bitcoin for example, you're still gonna have an extremely hard time growing.
These are just my suspections / opinions.