Finding Workarounds for Email Identification with Waterfalls

If I want to use 3 waterfalls to identify emails, I’m limited because of capped columns. Any smooth workaround this? I don’t want to export, import, export, import csvs in a loop to just fetch emails. Is the easiest way to just copy the entire column and paste into text, and then remove the waterfall, then create a new waterfall for the next person?