you need to replace remote and receiver. receiver is located under ceiling canopy. refer to you installation booklet that came with fan.
Model #337001WH available at HD
If you're looking to replace the fan remote next, you can find replacements at Amazon and Wayfair. I found a good article below that talks about where to find replacement Kichler ceiling fan remotes, and also what they look like. They have a picture of your remote there - is that the right one?
https://kichler-ceiling-fans.com/2023/07/02/kichler-ceiling-fan-remote-uc7206t/