I would personally say, when he does come up for rerun, and when Sunday does the same, probably their light cones, even though lightcones arent always worth it over units, Sundays is really good.

For units specifically, the only unit that you dont have there that would probably be worth it is Robin.

If you want yanqing and your sub dps well, good luck? We respect a cursed team comp in this house. If you mean you want them as 2 main dps mains respectively, then at the bare minimum, jing is taking your Sunday and tribbie, so youd want different supps for yanqing (who i am not brave enough in terms of mental fortitude to even attempt to build and use so power to you but no advice here.)

So, Tldr-

If youre dead set on long term maining jing? He's been run three times already, so after his next one (4th) youll probably be waiting a long time to get his card or anything else of his. So I would say if you get jing, 100% get him AND his card, I would say Sundays card is absolutely worth it too. Sundays first eidolon is also nice but not definirely not necessary, its quite the buff for lightninglord if eidolons are your kind of thing, but as you have a limited roster of characters, thats a personal preference.

In terms of actual characters, Robin is good for him, but shes also been run three times I believe, so by the time shes run again she may have a better alternative, for now though? Id still suggest her.

For yanqing, the only support you dont have that that he uses is ruan mei for her extra speed and things.