In a large bowl, combine the ground beef, egg, almond flour, finely diced yellow onion, and minced garlic.
Add the coconut aminos, tomato paste, sea salt, black pepper, and dried thyme to the bowl.
Mix the ingredients by hand until just combined, being careful not to overwork the meat to ensure a tender texture.
Shape the mixture into a compact loaf and place it onto a large piece of aluminum foil.
Fold the edges of the foil up around the sides of the loaf to create a shallow boat that will catch the juices during cooking.
Pour 1 cup of water into the bottom of the Instant Pot inner pot and place the trivet inside.
Carefully lower the foil-wrapped meatloaf onto the trivet using the foil edges as handles.
Secure the lid, set the valve to sealing, and select Manual or Pressure Cook on high for 25 minutes.
Once the timer finishes, allow the pressure to release naturally for 10 minutes before venting the remaining steam.
Lift the meatloaf out using the foil, let it rest for 5 minutes to lock in juices, then slice into thick portions and serve.