You need to get your average down to 63.00 or lower.
You could keep playing stroke rounds to lower your average or you could beat some higher tiered players in match play. That's actually how I managed to get to TM. After making Master in Jan, I got my avg down to around 67 and then had a lucky run at match play. By mid-Feb, I was a Tour Master.
You also need to 40 rounds, I believe, as a Master to go along with the 63 avg. I didn't check to see how many you may already have but when you say it's been so long since you last moved up, I'm assuming you already have enough rounds.
Good luck.