I think you're right here, smart investors will be averaging in between this range. Some will go all in around $20K, which may or may not work out in the short-term, even in the long-term it'll likely still be considered a good buying price. For example based on the graph you posted, we are at the equivalent of $6K in 2018 or $300 in 2015 based on bear market draw-down, where previously investors began accumulating again.
I personally remember returning profit into the market around $6.5K in 2018. While in the short-term price dropped in half, in the long-term, it was a good average price during that bear market. Because ultimately, no-one really knows if we will definitively go lower from here, and if we don't, there will be many that will wish they had already began accumulating at this level (in order to average in at a higher price if necessary).
Also to note, we are at the April 2013 equivalent lows. While the correction has been significantly longer than back then, arguably it has been as aggressive. I imagine many people back then would have assumed Bitcoin would of dropped to $10-$30 after such a parabolic move, but instead, for whatever reason, it made a low around $65 before continuing up to $1200.
In the long term, any Bitcoin purchases made in the last 2-3 months will be considered a successful investment of your funds. Therefore, we can say with confidence that at least part of your free money can now buy bitcoin. I strongly do not recommend anyone to wait for the maximum bottom and buy bitcoin, as they say, with one order. With a probability of 99%, such people will not be able to buy at the bottom for 2 reasons:
1 - They will not wait for the bottom that they have outlined for themselves and the price will turn into bullish growth, but without them, and they will have to rush to buy already at higher prices than they previously had the opportunity.
2 -They will wait for the bottom they expected, buy, and the market will give them a new bottom and their investments will immediately be under water, without the possibility of averaging.
Therefore, it is most reasonable to buy in parts, by the ladder method. Lowering the cost of your bitcoins, if suddenly the market drops even lower after your purchases. As a result, if, for example, you buy a portion at 20,000, a portion at 18,000, a portion at 16,000, a portion at 14,000, a portion at 12,000, and a portion at 10,000, then when calculating the average price, it turns out that you bought bitcoins at 15,000. Not the lowest value, but close to the bottom and most importantly, getting such an entry price is much more realistic than trying to buy everything at once with one lot at the maximum bottom.