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?
Be careful on daily trading and don't invest too much % of your capital in one project. But as a strategy I would stick to the strong altcoins right now.
Yes, now bitcoin already corrected a lot and if Bitcoin start moving up then we can see corrections in all altcoins so it is better to hold only those strong and good altcoins instead of investing in all junk altcoins. I'm expecting soon bitcoin prices to go up so invest carefully in altcoin for now and book some profits if you already from your earlier investments.