How to Synchronize Two LED Strip Effects to Start Simultaneously?

Hello everyone, I need help ASAP 😩 I have two LED strips that I want to light up simultaneously (one gradually from 0% to 20% brightness; the other with a chasing light effect). My two functions work well independently or one after the other, but it's impossible to get them to start simultaneously. Does anyone have any ideas?

I'm using an Arduino Uno board for this project.
Thanks!
Code: πŸ‘©β€πŸ’»
Solution
Your code contains certain errors like
Repetition in the loop function, you misplaced the function fastLed.show(), you didn't multi thread the led handling.
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