Possibly because I am the most powerful being in this area.

[ Barbatos, who eschewed worship and governance, is the weakest of the Seven. Zhongli may not be as powerful as the Tsaritsa, but his wisdom and ability to call on his element regardless of where he is would lend him a very big advantage in any combat situation. ]

By limiting my ability to interfere, the plans of our mysterious host would be more likely to come to fruition. [ It's something Zhongli would have done were he in that role, too. ]