Your turn is still invalid...
You must conquer a zone bordering the zone you conquered, which means you must conquer a zone from Bong. Since that would cost 10, and the new zone would cost 30 to conquer, it would cost a total of 40 resources, so you can't do that during this turn.
And Fiah, it isn't worth it either. I highly recommend that you follow the blan in my PM.