Nothing to be done. You are on the Bull Route? Axel is the only interaction meaningful interaction among the Bulls for you now.
If you want more to do with Thane (and Nauxus) play the neutral Route with another Playthrough.
https://itch.io/t/1392488/good-ending
click the link and read first:
The only requirement for making peace is (NEUTRAL ENDING):
Skull Emblem + Soul Emblem (underground city auction) + the bloody cloth + visit the mysterious dragon within the magical paintings.
after that, read:
In my opinion the "BEST good/neutral ending":
If you don't know what i am talking about in that linked thread, you should read the official guide as help.