EvaDiggy_Seatrainporea I was in Egypt when Diggy's 4th Birthday first came out and felt overwhelmed as well. The difference between the 5th Birthday and the 6th Birthday is that the 5th isn't Segmented and the 6th is. That means the Challenge Areas in the 5th are going to be more difficult because they were designed with Tiles and Materials meant for the higher Regions. The best strategy for tackling these is not to have a goal of clearing them, but rather of getting what you can from them that matters and leaving the rest behind. So you are going to want to get at least enough of the Special Item (in this case, the Pixel Vizsla) to fulfil the required amount needed to get the Achievement, and whatever additional amount to get a good piece or two of Camp Equipment. You should try to get any Chests and Experience Crates along the way since these don't require you to use up energy to break them but will give you something in return. While doing this you should try to clear a path to everything you are trying to get by breaking only the tiles you need to, and trying to break the ones of lesser value if there is more than one way to get to something. The next thing to concentrate on trying to accomplish are any quests you are being given that will open up some door, gate or house. This will give you access to a lot of Materials and usually more Experience Crates.
While the Challenge Areas in these unSegmented Special Events can be extremely difficult for low level players, they offer a chance to gather Materials for higher Regions, and that can make the player more ready to tackle those higher Regions when they do get to them eventually.
You might get the chance to do any Special Event again. Some do get reintroduced for Free and others get rotated for purchase in the Shop. It is a good idea sometimes to hold onto any extra Special Items you have left over from them if there was anything really worthwhile you were able to purchase with them, since those can be added to any you get the next time around.