How does it work? China buys high and sell low? Who are the ones who bought at 4500? Surely they need to keep buying now, don't they!?
If you only bought BTC at $4500, and you did not buy any other BTC at any other price point, then surely it would be a good idea to buy a bit more right now, and to bring down your average cost per BTC. If you are engaging in incrementalism buying and you have a view of bitcoin for the future, then you are going to work out some incrementalism buying strategy, and it is not going to matter whole hell-of-a lot whether your average cost per BTC is currently $4500 or $3700 or some price point in between because you should just be slowly building up your holdings and trying to be a reasonable and prudent as you can be in order to continue to HODL and to accumulate.. and maybe even sell a little bit, If you have some coins that have an average cost that is lower than your selling point.
So yeah, attempting to paint some pure case about someone who stagnantly bought at $4500 seems to be a strawman assertion about a kind of buyer that is not engaged in a prudent and incrementalist buying/accumulation strategy.