Overclocking monitor would degrade it's functionality and damage it, thus it's not safe practice and will void your warranty.
- Here is a comprehensive guide step by step on how to overclock your monitor: How to overclock your monitor >> https://www.techadvisor.co.uk/how-to/pc-peripheral/how-overclock-your-monitor-3635779/
- Here are some third party tools that could use for the same purpose: How to overclock your monitor to a higher refresh rate: https://www.pcgamer.com/how-to-overclock-your-monitor-to-a-higher-refresh-rate/