These few weeks have so many time challenge events, great. Fun stuff.
But as you all know lich players are really bad with these time challenges... My suggestion to balance things out make some different type of challenges. you could get creative with this. For example: Like battles that get increasingly more difficult in waves. The further you'll get, the better the reward. Or the longer you'll survive, the better the score.
Also the events tend to favor he TOP players way more. Meaning the gap between the strongest and the weakest will grow even more! Hopefully you are open to creating events with no pay to win mindset. So weaker players CAN win. So the gap can close a bit and things can balance out more. Maybe you can divide the players into groups depending on their castle level, research power and heroes power. Each groups gets to challenge a different difficulty