everyone can profit from that saying, the trouble is not the saying, it is the fact that people can't do it. When bitcoin crashed to 4k in march, people sold because they thought it would go lower, hell some people actually sold so that they could buy a bunch of bitcoins lower. What happened? It went higher.
I am not 100% sure what you meant there, you are saying that people sold at 4k when the panicked but then you say they did that to buy at lower price but why would you sell BTC at 4k to buy it at 5k ? .. I mean this just doesn't make sense or I am sorry I failed to understand your logic.
If Bitcoin breaks through this resistance level, a further sustainable rally towards $10,500, $11,000, and $11,600 is on the table.
Look I love to see the price rising because only scenario where everyone wins is when the price moves up but I have failed to understand how $9300 is different than $10,000 and why people make hard targets in their minds, I have seen people being worried that bitcoin is not reaching a certain value but why do you want it to hit 10K?
If you are an investor then just wait because you should not be bothered by a few hundred dollars movement. While if you a day trader and make trades all day then you should actually be wanting the price to go down as well as go up to continue making profits.