How to Ensure My Device Connects to 5 GHz for Better Internet Speed?

I’m currently working on the website fominsoap.com, and I’ve been experiencing some internet speed issues. I’ve noticed that my connection speed is significantly slower than expected, averaging around 40 Mbps. I’m wondering if this could be related to my device connecting to the 2.4 GHz band instead of the 5 GHz band, as I’ve heard that the 2.4 GHz band is often slower.

Could you provide guidance on how to ensure my device connects to the 5 GHz band for optimal performance? Additionally, are there other factors I should consider that might be affecting my internet speed?