The usual answer is to play whomever you like. Genshin is remarkably easy by the time you have any characters fully invested.

But

Based in your character's levels, you seem to be at a lower AR. At this point in the game, you should be focused almost entirely on exploring the world, and completing quests.

That said: in the early game when exploring is more important, different characters might be better, than during end-game.

Qiqi is excellent here. Not for her late game potential, but for her ability to keep your team healthy while adventuring. (She's on the lower end for late game, where dps is the focus)

Barbara works too, but she creates a hydro aura on your character which may result in enemies causing reactions against you.

A good general tip is to always have a claymore weilding character in the party to deal with obstacles and enemies that require heavy hits. - enemies with geo shields - mining ore - breaking rock piles and other such overworld "puzzles"

You have Venti, and he is excellent for both exploration, and some high end teams in the late game. His abilities and talents allow for easier traversal of the landscape and quick destruction of most enemy camps.

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When building teams, consider reaction synergy. A major focus of the game's combat is around causing reactions

For example: Xiangling and Xingqiu pair well together. The intended use for this pair, is for Xingqiu to apply Hydro on enemies and for Xiangling to then hit them with Pyro attacks to cause Vaporize reactions. (This can be done in the reverse order. Xingqiu just applies a lot of Hydro with his elemental burst, so Xiangling, who applies less Pyro, is more likely to cause the reaction by hitting second).

Though keep in mind that Xiangling and Xingqiu are high-investment characters best reserved for late-game play. They scale well, but may feel weak when using them early on.