Being a baron has three tasks, that is, helping the blacksmith of Forchris find a dog, helping an old Lord steal things near or in a pub, and helping a priest of a cemetery get his diary back. You didn't finish it, so there is no baron option.

The Elder Scrolls 5 Baron Phocles Mission:

1. Under normal circumstances, at the level of 10, you will receive a letter from Lord Phocles, and then go to Phocles to find the Lord.

He will let you go to the mine to destroy the robbers. After destruction, the Lord will give you the right to buy real estate. If you don't have the option to sell, go to the housekeeper around the Lord.

Then you can become a baron after you have completed three tasks to help the residents.

The Lord will give you a personal bodyguard. The specific tasks are to help the blacksmith of Forchris find the dog, to help an old Lord steal things near or in a pub, and to help a priest of a cemetery get back his diary. It is a task to collect vegetables and sell them to farmers or investment shops.

3. You can become a baron when you finish. Of course, you can buy a house without becoming a baron. But you must receive a letter from God. If you don't receive the letter, wait. I didn't get a letter when I was born. In addition, make sure that the DLC of the fire has been hooked.