most fences are just a suggestion for cows.
that being said a strong suggestion for your steer, would be a solar charger and a single or double strand of hot wire. super easy, especially since you already have the posts in the ground. the make insulators for t-post(the make them for either way the t post is facing), and wooden posts. relatively cheap insurance.
however, on the off chance, that you simply came on here for assertions that you don't need to do anything to keep your steer in the fence, leave it as is, and roll the proverbial dice.
Ok, I think I will do that solar charger. I was under the false opinion that solar fence chargers are super expensive, but to my surprise they aren't! So mr.steer get ready for a shock! And do not worry, there will be another steer joining him soon so that he is not lonely.