Bitcoin price just go down today after it breaks its support of $8500, so I guess you need to wait for some time and need the market price to stabilize before getting in. There might be some panic seller after they saw the price go down so there is a possibility that the price will even go lower in the next days.
Just to get back on the OP topic. He (OP) is trying to have long-term investment (holding). In this case, chart or daily price changes shouldn't be a big matter for him. He shouldn't need to wait the price to go lower, cause the main point is only to take profit by the end of his long-term plan.
Even though, buying at lower price is better cause he can get more Bitcoin, it's just not the main point. He could wait more time but if he doesn't really know when to buy, that would just ruin his long-term plan.