Once your 5* has already reached its first evolution at level 20, it will become expensive on birds and gold to continue levelling up, especially towards the end. You have probably already heard of the tip to use 3* birds to level them up. However that is more of a general tip. I believe you can fine tune this even further. The first step is to do the first evolution of a lower level bird, not just 3*, then use this bird to level up your stronger bird. The amount of XP gain can be seen by hovering the bird over the level up box without dropping it. This way you can see which birds provide what amount of level up and work out the best combination for you to help your bird reach the next 20 levels before the next evolution. As a guide, the amount of XP gained from highest to lowest for your first evolution birds are as follows: 3* shiny > 2* shiny > 3* > 1* shiny > 2* > 1* What I like to do is evolve the higher one on the list that I have available depending on how much level up is needed for your stronger bird. If not much, you can use a 1* bird. If unsure, I level up a non shiny bird, and hover it in the level up box to check, if it's not enough, you can either save this bird for elsewhere or use a shiny totem on it. Mix and match and you will soon learn how to most efficiently level up your 5* birds. What you can also consider is that a lower * bird will require less birds, gold and evolution material to reach its first evolution. So my personal favourite is to evolve a shiny 2* bird over a 3* non shiny bird as most guides suggest. One final tip for when you're going from level 60-80 or 80-100... 4* shiny birds which have reached level 50-60 work a treat! Obviously save this for XP bonus day.