Combine the rolled oats, wheat bran, barley flakes, sunflower seeds, pumpkin seeds, sliced almonds, and chopped walnuts in a large mixing bowl. Mix thoroughly to ensure the ingredients are evenly distributed.
Add the raisins, dried cranberries, and chopped dried apricots to the bowl. Stir the mixture to incorporate the dried fruits evenly throughout.
Sprinkle the chia seeds, flaxseed meal, cinnamon, and a pinch of salt over the mixture. Mix well until all the ingredients are combined and the spices are evenly distributed.
Add the coconut flakes and give the muesli one final stir to combine all the elements.
Transfer the muesli to an airtight container for storage.