I think the duels need to be more optimizable, e.g. best of 3 or best of 5 (badlion had this feature), and hud for choosing the duel options. The duel queue could be easier to use for new players by changing the command to /duel (name) instead of /duel duel (even though it tells the player to do /duel duel after doing /duel, players still ask how to duel). After doing the command, the the player will be shown a duel hud, asking the player what kit, best of 1/3/5, and even what map to play on.
Good suggestion! I suggest that team duels should be not limited to 1v2/2v1. Implementing FFA/RR/Team fight gamemodes in parties can help too.
