Newer OA seller. Having trouble

New OA seller here doing reverse storefront sourcing (what everyone says is best method ).

It seems like it’s taking me a ridiculous amount of time to find anything worthwhile. I’m scanning for hours, eliminating most listings due to unstable Buy Box history, low sales, or th biggest being just WEAK ROI, and barely finding ASINs that meet my criteria..

For those experienced with OA is this just normal in the beginning while building pattern recognition, ORR does it sound like my sourcing approach is inefficient?

Trying to figure out if this is just reps or if I need to adjust my process.