I have won a lot in the past months
BTCBut in the last month I suffered heavy losses

What do my trading friends tell me to go beyond this difficult period?
I don't think that we are in a difficult period what we are seeing is a bearish trend. The best strategy is to buy at this rate because the coins are very cheap and then try to hold on it because we can't go that long without having a good bull run. It's 2018 and people may have a renewed interest on the market once more. So that advantage of the current situation, buy in dips and when the market started to peak up again, then I'm sure that you are going to earn a good amount. Be patience and just continue to hold.
And as suffered have mentioned, everyone has suffered a lost on the last 2 weeks because of the sudden drop of the price. But we are not going to be frustrated because we all know that the market will rebound in the next coming months.