that's true, patience is vitue, investment in bitcoin really test you self mentally and emotionally, i guess if hold some altcoins and it goes down so deeply just let it be, remember that bitcoin is volatile, i assure you it will bounce back soon. dont panic when price is totally goes down just wait to pump up again so you could recover your losses.
That seems to be too confident approach but when it comes to the near future aspects I think we should be really careful about it. Being careful I mean to say that we should not just be ignorant when prices are dropping for the bitcoin. Any person who has invested in the bitcoin when it was around 15K or more than that will obviously turn out to be crazy about the whole situation and might go on selling the coins. He cant be relaxed at such bigger losses and how he can be relied at such point.
In such situation it would better to recover the part of investment and then re-invest into the bitcoin at those low levels. Thus next time bitcoin pumps itself it can cover the losses due to bigger dump.