For example, you have some altcoin (in my case it's Metaverse ETP) and you expect it to grow. But in a weak market, this altcoin behaves like bull and you have the opportunity now to sell it and buy an asset that looks weak in the market (for example Qash, Tierion, Nem, Odyssey or Republic Protocol) in order to get the greatest possible profit. Or leave a strong asset and wait for its further growth. What do you think about this?
Sure, diversification is a key to success. Do not keep all your eggs in one basket. Still, if the ALTs are going up, most of them do, but good ones can go way higher and on average you will be doing pretty well if your portfolio is diversified.
I would add surely BTC and ETH to the portfolio, as they are a must in a portfolio in my opinion.