You can't control your ranking.
Some days you're on the 1st page and some days you're on the 4th.
You just need to focus on ways to improve your gig and make it more attractive.
You don't have to be online for 12 hours a day, the way to get impressions and orders is different. There are lots of methods to improve your gig, you can find most of them in people's replies on this topic.