See it an opportunity for you to buy bitcoin since the price is low, you would have a greater return once the bitcoin price recovers.
Yes, the bad news about China has significantly affected the sale of coins and lowered the price of bitcoin, but over time everything is stabilized. I am sure that by the end of the year we will be able to profit from our coins.
If you really want big profits, buy bitcoins at the moment because they are not at 4k dollars yet. It is utterly true that bitcoins are going to be at 5k dollars by the end of this year.
You said it very well that you are not going to sell at dumps and not going to buy at pumps, that will be wise decision if you do so. So better is to buy now, it is dump time somehow.