Small update: It happened what I thought. While Bitcoin has risen, the altcoins have dropped against BTC:
''With an upmove of Bitcoin it could also be that altcoins drop against Bitcoin. What would I do if that happens? I'm honest, I wouldn't do anything and accept the ''losses'' as I expect altscoins to get their time and shoot up. This shows that even in bullish times the market is making people lose their money.''
What does that mean for me? As I wrote in the quote above, I will continue to keep altcoins. I do not care how far they could fall or when they will start climbing. Altcoins are currently very cheap. As soon as they start to climb we will not see these prices for a long time. That could happen tomorrow or in 2 years but it will happen!
I wish you good luck and a good start to the coming week!