Have you played in the last year (season 55 or later)? You can check here:
https://dominionleague.org/player_database.html. If so, list the tier you earned based on your placement that season. If you have never played in the Dominion League before, or if you last played in Season 54 or earlier, please select New. If you're playing in Season 60, fill out the Returning Form (pinned in your division's Discord channel) instead!