Hi and welcome!
Unfortunately, it's not uncommon to wait much longer than a week for your first order, especially if there are a lot of other sellers offering the same service as you.
What I always recommend to new sellers having this same problem is to search for your own gig(s) as if you were a buyer. Look at what the top sellers in your niche are doing--graphics, descriptions, general branding--and think about what you can do to make your gig offering more like those sellers. Do that, give it another few weeks, and then adjust accordingly if you're still not getting results.
Good luck!