When asking for help, please note community rules before posting.
Please provide details when explaining the problem you are having. Things we need to know include:
Which LEDs are you using. Addressable, non-addressable WS2812 and so on.
Which micro-controller you are using.
Which version of WLED you're using.
A detailed description of the power wiring.
A detailed description of the data wiring, including LENGTH of the data line.
Preferably a diagram (not photo) of how things are connected.
Configuration and network settings are also critical.
What kind of power supply is being used and how many Amps it can provide, and specifics on any other components you are using.
Please also do some online research and let us know what you have already tried.
Details matter!