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What I have seen so far is that the price can fluctuate between 100 to 300 dollars up pr down on a daily basis, however the line is still going up in the bigger picture. Do you expect the bitcoin price to be more stable after the segwit2x fork?

because people are confused right now weather bitcoin price goes up or not after the segwit2x fork. They want to keep their bitcoin handy in case of fall. If bitcoin price goes up sharply they sell their altcoins and wait for btc to reach higher high so that they can sell them. other way if btc price falls a couple of 100$ they get panic and think btc already reached higher high & sell their altcoins & keep bitcoin ready to sell expecting it to go down further. In both the case most of the altcoins drop significantly. So its very risky to trade in such situation.
I think this is the reason lot of altcoin have lost 20% - 30% or even more in btc value since few days.

I see I will wait with investing till after every has settled down. The bulk of my bitcoins is for long term a part I will use for currency trading. I do have some eth too.