Your portfolio down until 70% better keep hold it and waiting time take recovery or make cut loss when your portfolio down under 40% or 30%. Still the same with you I got down portfolio and have been 1 years waiting when price going up, but my portfolio down under 40% and have take recovery last several months, but sadness not selling my altcoin until get down again and loss opportunity to get back my capital. I think not have to worried if you hold potential coin your portfolio will back to the top price, keep hope and don't forget pray every time get back your altcoin holding reach higher price.
Holding it will be a very hard thing when you are down that much but people need to learn this.
Selling it at a 50% loss is way much harder. Remember holders never lose something until he sells.
I hope that people would learn how to hold, but if they are holding something like Luna then we shouldn't say that they should hold and it will recover, holding could be still done in that case but it will probably not recover. So, it is going to be something that would be difficult, both keep holding it but first you need to learn to pick something decent.
To learn how to hold need strong faith in the BTC. Having all the knowledge in the crypto world won't let you hold unless you have a strong belief in the BTC market.
Many, just like in 2018, remain with their coins, there are those who were waiting for the alt season,
It looks like alt season won't come this semester, worst, this year.