It seems like the best time to sell altcoins is over, as we know that the best history of altcoins is 2017 until March 2018, almost all altcoins prices go up because they follow the trend of bitcoin prices, now we can only survive and wait for a miracle.
I like that "wait for a miracle", if only it happened sooner. Yeah, we've been waiting for too long for alts price to recover. With how bitcoin and alts prices for the last week, I believe we will see that so called miracle sooner or later than what we're expecting.
And lots of people who have suffered from the dropped prices in the middle of 2018. so hodl will be the best option.
It is natural if there is no development regarding altcoin until now because I think the development of altcoin prices will begin in 2020. If you still believe in altcoin, I suggest choosing altcoin that has useful functions and is much needed, such as ethereum. but selling altcoin for bitcoin is also pretty good for now because its potential can also be very good when prices start to rise.