Anyone can start diversifying its portfolio at anytime. An example is 70% bitcoin, 20% gold and silver which is talked about and 10% altcoins portfolio. You can start them with bitcoin accumulation.
But the issue I see is that it is very clear that gold can not give the return that bitcoin can give. Silver can give it but I prefer and trust bitcoin than silver to give higher returns, not in usability.
None of these assets give higher return like bitcoin but it's a coin with two sides. When the reverse side happen, you'll likely regret while you chose it over gold. I don't think anyone buys gold expecting 100x return from it in few years. The highest it can get in a year is about 1-2% but the good side of it is that it doesn't depreciate rapidly like bitcoin that gives high return. BTC has potential to do 10x but at the same time can do -80% during bad days. Alt is gambling, unless you're good in trading to be taking your chances. Diversifying on these assets should be based on their role and not about return because they are incomparable. BTC for potential high profit and gold for maintaining your wealth.