Can you cost average down to a break even point?

First, I think I’m using the correct phrasing in the title? Please, correct me if I am wrong.

I am trying to figure out how much I would need to invest in order to cost average down to a break even point and exit my positions.

Here is one of my positions in TSLA as an example. My average price is $308.47 and 24.3519 shares. Last price was roughly $123.88.

I haven’t been able to find a calculator or anything in order to accurately find how much I need to invest in order to exit a position at a break even price or if it’s even possible.