Figure out your bitcoin plan first, and then maybe if you have accumulated a decent amount of bitcoin, then maybe at some point it might become justifiable to diversify, but talking about diversification into gold and/or silver makes it sound like you are pumping inferior products and trying to compare them to bitcoin when bitcoin is likely in the ballpark of 1000x better then each of them...so no need to discuss any particulars of them or to pump them, especially here in this thread when we are talking about bitcoin.
About the idea of diversifying into several forms of investment and it's not much better than trying to make a percentage purchase of bitcoin. In the past, I was one of the people who bought gold to save and the price movement was not much better even though I had kept it for more than five years. Finally I decided to buy bitcoin as an investment asset that I held and the comparison in the same five years was much more favorable to bitcoin. Regarding the risk that is often talked about and I think it really depends on our mental readiness, if bitcoin is bought and held then it should not be part of short-term trading so we will not experience any risk.
The bitcoin cycle will continue to repeat itself and if we don't panic when holding then that's where we will get big profits from the process that will occur towards the next ATH. Gold does not offer such a concept and it is much more stable in making small profits and I have experienced this in the last 10 years.