You're trying to make this more complicated than it is while my mantra is always simplify, simplify simplify.

The green line is only a marker of closed trades per $1K traded on the strategy during the day (see the parenthesis explanation of the chart and follow the green line to the right axis.)

There is a LOD every single day. That is the definition of low of the day. If it on the first bar, it is the low of the first bar. The previous day's low is irrelevant.

I'm not saying trade ONLY at the low of the day. I have two day-trading signals for options. One at the open and one at the low of the day. I would suggest until one is very experience at day trading options, the above or below the open is the better signal to work with. The open on that chart is the purple line.

To trade the low of the day, as I've said, takes a low of the day and at least one technical indicator the trader trusts to indicate price is going to reverse off that low. I've shown technical indicators before but on that chart it is the yellow color-coding. What is your trusted technical indicator?

Let me ask you about Trading View. Can it color-code indicators on price? Can it automate execution of trading strategies?