stop writing nonsense, if you are afraid of volatility, than cryptocurrencies are not for you. The ether always falls stronger when bitcoin falls and grows stronger when bitcoin grows. Look at 2017, the capitalization of the two coins was almost equal, fall saved bitcoin, perhaps for this reason it was carried out, bitcoin took advantage of the fact that other coins depend on it, but soon the ether will be the first, and everything will depend on the ether. Use low price to buy!
See how strong the ETH! It broke the long-term trend line of bitcoin, replaced it with another line

Nice graph, it shows the downtrend of Ethereum!

I don't know why did you draw these lines, but they make no sense to me, sorry.

ETH had a low of 9.85% on Dec. 2017, this could have been a support if it had shown a rebound after the last sell-off but no, ETH is keep losing dominance and it's now on 8.90%.
Now compare it to XRP, I notice 2 things: (1) Before the last two rallies, XRP moved first and then ETH followed, both taking some dominance out of BTC and other coins.
The 1st one was on 3/5/2017 (ETH followed on 19/5) and the 2nd one is on 13/12/2017 for XRP (ETH followed on 8/1/2018)!
Lately, XRP is again giving signs of a rally, on 21/9 it spiked up but ETH didn't follow it, this time both ETH and BTC lost some dominance to XRP which is getting closer to the January's high.
Ofcourse trends are breaking often, but if you're wondering what's the current trend,
I'd say BTC is going SIDEWAYS, ETH is going DOWN, XRP is going UP.
Disclaimer: I'm not endorsing any coin over the other, I'm simply stating what I'm seeing in the graphs. However the graphs can be understood with more than one way, so feel free to disagree with my view.