Hi elapid95,
The Aria is one of their firmest mattresses but all new mattresses will go through an initial break in period over the first few weeks and it can also take a few weeks for your body to adjust to a new sleeping surface depending on how different it is from the mattress you are used to sleeping on.
While you will need to wait for 30 days before you can return it (assuming you ordered from the Dreamfoam site), there are also some suggestions in post #2 here that may be helpful and by the time your break in and adjustment period is over you may find that it’s a good match for you if you prefer firmer memory foam mattresses.
Phoenix