if you think selling your bitcoin with current market situation will make some profit for you or will cover your lost, i think you should consider it until the last of 2018. this is just the beginning for market to recover. but if you have make some profit before, dont be greedy! the price will reach every possibilities in cryptocurrency. so make your good decision.
Yeah, it's smarter to hold right now because the market has only started to rise. BTC is yet to reach high levels. There is no need to sell now if you want to profit big time.