I would not recommend to forget any kind of investment. This is one of the reason why many people missed out on profit in altcoin. Although Bitcoin is believed to be ever rallying even with dips, it still ends up breaking its ATH, forgetting our Bitcoin investment may make us not to remember it. Instead, we should be firm with our beliefs and keep on holding while we keep ourselves updated on current events. We never know what the future of Bitcoin is, so the possibility of the Bitcoin market crashing and never recovering may happen. If this happens we will end up missing the opportunity to sell at a profit.
It's true and not wrong, many people lose funds if they invest other than BTC, especially if the price goes down. What is generally seen is that if we are in the uncomfortable position of having to sell during a decline, the potential for losing money is quite obvious. If we are patient, perhaps another option is to hold on and hope the price rises again while risking higher losses if the price continues to fall.
It cannot be denied, anything can happen in the market and this digital financial system has served us well, but I think the time is not yet for BTC. Regarding the consideration of a crash, caution must be taken but, if we look now the bigger economic behavior is currently in Bitcoin and many large trading companies are coming to the table with their money to invest in BTC. I personally think BTC is still very promising.