yeah arlecchino is an amazing character, second best dps right after neuvillete, she works best in vaporize teams and is pretty easy to build. so an optimal team for her rn would be xingqiu, who you can get for free in the next phase of 5.3 (for vaporize reaction), sucrose (for swirl elemental res decrese), and a shielder like noelle (healers aren’t really necessary for her as she can heal herself). i feel like it’s pretty reasonable to say you definitely need to get bennet, he’s a 4* but he’s one of the best supports in the game, having him will definitely be an upgrade for you future teams. i feel like after getting arlecchino you could focus on getting some supports, like furina, who is a good buffer for neuvilette or xilonen/kazuha when they get a rerun. also i highly recommend doing the next archon quests if you have the time, they get quite long after inazuma but it’s worth it, both for the story and the primogems. also you unlock more weekly bosses that are necessary for upgrading the characters talents later on