Monarch

Long story short, I commissioned and paid a high profile artist back in July for a half body commission. Four months later, with no communications since the initial commission info gathering. I've sent an email to ask for an update to no response, yet I see them active on social media. I still have two months left until the time to file a claim expires, so I want to be patient and give them more time before I give an ultimatum. What I want to know is, do I absolutely need to escalate to a claim before the 180 days expire? Or am I free to wait until the last day, open a dispute, and then wait for those 19 days and then escalate it to a claim?