Options priority

I have a few options placed to sell calls. Day after day I see a lot of volume for the calls that I am selling, for the same price that I’m selling at, but rarely do any of my calls sell. I have multiple orders for the same ticker, date, and strike price. It appears to be random which orders get chosen. Sometimes it’s the newer order, sometimes it’s the older order. Sometimes the bigger order, sometimes the smaller order. Is there any way to gain an advantage to help your contracts have a better chance of being chosen?

If there’s 5000 opens for the same price and 1 is bought, who sells it?

Thank you for your help and look forward to your advice