I bought some bitcoin in March 2017, sell half of it in Dec 2017 and hodl the other half since then. The current downward trend seem to last for a very long time and I'm quite upset about it. What do you guys think? Should I hodl or sell all my BTC now?
Continue holding and avoid selling at this moment. Profit will be lost if you would sell at this moment knowing that the market value of not only Bitcoin but most of the cryptos are on downtrend. Once recovery start, that would be the right time to sell depending on your satisfaction regarding with the price of your holdings. Dumps are not permanent so we may expect for positive marks soon. For now wait and hold.
Well if you bought last march, then you'd still be in profit even if you sell now. But it's probably better and would be more profitable if you can wait for the price to move upto another ath. That is if you can afford to wait a lot longer