The turkey experts at Butterball [1] say a few common mistakes Americans make when roasting their turkey is using a pan that is too deep (we're talking 8 inches [2]) and not using a roasting rack. The heat from the oven can't possibly reach the bird when there is a giant metal barrier! The ideal pan to use is around 2 1/2 inches high [3]. But, if you are determined to use the pan you have, here's how you can fake the height difference: place a muffin tin upside down on the bottom of the pan! This simultaneously lifts the turkey up and acts as a roasting rack hack, so all that glorious hot air can circulate around the bird.
Links:
[1] http://www.butterball.com/
[2] https://goto.target.com/c/1141873/520943/2092?u=http://www.target.com/p/graniteware-covered-rectangular-roaster-black/-/A-13915592&subId1=___psv__p_39204846__t_w__d_d_&subId3=product
[3] https://go.skimresources.com/?id=1025X1701743&url=http://www.jcpenney.com/berghoff-16-virgo-studio-roasting-pan/prod.jump?ppId=pp5001521377%26country=US%26currency=USD%26selectedSKUId=78280250018%26selectedLotId=7828025%26fromBag=true%26cm_mmc=ShoppingFeed-_-GooglePLA-_-Roasting%2520Pans-_-78280250018%26utm_medium=cse%26utm_source=google%26utm_campaign=roasting%2520pans%26utm_content=78280250018%26cid=cse%257Cgoogle%257C004%2520%2D%2520home%2520furn%2520leisure%257Croasting%2520pans_78280250018&xcust=___psv__p_39204846__t_w__d_d_