If you wanna get involved in the main plot anyway, Yizhi's got some ideas he can't really act on and at this point the first Sutoku contact he would think of is probably Tama. But if that's not really your interest rn that's fine too!

Yizhi would be suggesting Tama get his faction to look into or even lock down Kaberou, because he thinks Ringo-chan's kidnapping is targeted and that means her father is involved. But if you have other thoughts, you can pitch them and see if Yizhi has an excuse to feed it to Tama haha