If you have the money to invest in both of those markets then it is a good idea to do it, gold and silver have been valuable for a very long time and their value is recognized all over the world, so you cannot go wrong by investing in gold and silver, just remember that it is not likely that you are going to get the same amount of profits that you can get in the market of cryptocurrencies and that the amount of time you need to hold them to get profits is longer as well.