Hold Up, Don’t Get Rid of Your Steam Deck LCD (Just Yet)
You can do some pretty cool things with it that you currently can’t with the OLED.
Overclock Your GameCube Controller Adapter on Steam Deck
Finally, an easy way of doing it, and stays consistent across reboots too!
Turn Your Steam Deck OLED Into a Buttery-Smooth 120 Hz Machine With This Script
LCD models are also compatible with this script to run at 70 Hz.
Undervolting and Overclocking Your Deck: Tradeoffs
CryoByte33 has a nice tutorial going over how to do this, but be aware there are risks.