Co-Owned property with siblings. 50-50 share, refuses to buy out or sell

Inherited property with my sibling 12+ months ago, due to probate title only changed in Nov 24. Share is 50-50 as is on title. Informed that I wanted to be bought out or the property sold, have had multiple discussions over the past 12 months. Now that I want it actioned to buy another property, sibling refuses to do buy out or sell. They have lived in the property but have paid no financial benefit to myself.

What are my options?? Discussion turned into a heated argument with flat out refusal to do anything. Lawyer? Section 66G? Mediation??

Just want to know where I stand legally.