because I believe Ethereum price will soon increase very high (bull run) following Bitcoin price movement and of course I will get a very big profit from investing in Ethereum (my target for Ethereum price is $1100-$1400)
Ahhmm, as far as I am concern, Ethereum's price really pumped hard as well during the last quarter this year. It is currently $700+ and it's not bad at all. Such price is not the problem but you. You didn't made a mistake on investing on it, it is you who are expecting too much. No offense meant. Well, if you really want to hit that target then keep waiting, that's the least thing you can do.
because I believe if Bitcoin dominance decreases, then it will make the price of altcoin increases (including the price of Ethereum).
You are right somehow but eth is a little bit different among the rest. In my opinion,
eth is btc's shadow. So if you may notice, when btc pumps, eth pumps as well.