Regain old discord tag after losing nitro

I'm basically just bummed out that after having nitro for a month and then not renewing it, my discord tag got changed even though I didn't actually change it while I had nitro. I've had the account for over three years and feel cheated that I'm losing my old tag because I paid for nitro. My old tag since 2016 was 6887, but got changed to 3134 when nitro ran out yesterday. Currently trying to get a new one I like through dyno bot, thus the silly username.