Here are some tips for making your fake Christmas tree look fuller: 1. Choose a tree with a dense, full shape. Look for a tree with plenty of branches, ideally with multiple tiers. This will give your tree a more realistic look. 2. Add some extra branches or fillers. If you want to make your tree even fuller, you can purchase some additional branches or fillers to add to the tree. These can be purchased at most craft stores. 3. Use lights and ornaments to fill in the gaps. Once you've added additional branches or fillers, use lights and ornaments to fill in any remaining gaps