A few days I thought, I want to double my stake and I want to sell it all... Literally at the same time. Hodl seems a good idea though ATM, it's what I'm doing with most of my Bitcoin.
Never ever give room for second thoughts against your bitcoins. Holding must be the best option for those who have missed out $19.5k levels. At least you must have taken a big decisions to sell around $15k and right now it is too late for taking any decision other than continuing holding. It may sound funny but it is already year long of waiting. This is the time for buying more when it is so why not you just keep holding those already-bought/earned bitcoins.
I don't know myself and I can't predict the increase. But if the coin that I hold is valid and worth holding, I better hold it or I have to cut my losses.
You do not need to be an expert to predict the increase, it will happen on its own time hence just have patience and it would be better to go for a vacation on this festival/summer time. Experts are suggesting about buying more at dips hence it will definitely not the time for selling off.