The issue is knowing the "lowest prices" to buy altcoins, since most times we buy at dip and price still gets dipper, this happened to me when I bought DENT at 13 sats and price went down to 4 sats. It's best to accumulate in parts anyway, but I'm having my major holding (70%) in Bitcoin. Recently I bought more NPXS hoping for the best since the development so far is encouraging even though price is down.
indeed the price cannot be predicted. Knowing the low price of a coin cannot be done easily. especially if bitcoin prices are not stable. Maybe it will go down to 90%. Buying on a regular basis at each price can be an option, but you have to have enough funds to reach the lowest price. Target prices for you to buy beforehand and fund management to buy back when prices are very low.