The concept:

This concept is based on recent news of the second Earth Trojan being found. Some has speculated that there are thousands of objects in similar orbits here. The key is to find those that are in a very similar plane to Earth and closer to the center of L4 or L5 the better. More specifics:

https://en.wikipedia.org/wiki/2020_XL5

Related: The Case for a Deep Search for Earth’s Trojan Asteroids: https://arxiv.org/pdf/1903.01922.pdf

https://space.nss.org/l5-news-harvesting-the-asteroids/

It just seems like L4 is begging to have high res and optical sensors give it a flyby to see it there are a bunch of good object there. I chose L4 over L5 since you can drift "under" L4 and get great lighting from the sun (from Earth we see it pretty much from the side).