First off, take a look at some other advice on investing in cryptos - I'm not an expert.

Personally, I've been taking a MUCH closer look at Ethereum. If that amount is 1/10th of your silver stack, you shouldn't worry too much about putting that amount into cryptos. My best advice, and I'm not a big crypto investor, would be to spread it out over a few different ones - Bitcoin, Ethereum, Steem, DodgeCoin, etc.

On the other hand, if you feel you are holding too much silver and just want to scale your stack down to size, wait for the Gold-to-Silver ratio to come down to closer to 40:1, or better, and trade some of it in for physical gold. That will greatly reduce your stack size.