You might be able to replace the propane line and regulator with an adjustable one like this: https://www.amazon.com/gp/product/B096CRXM43/

I got this a while ago since my 30” doesn’t get hot enough, I love it:

GasOne 2109-RED 4 ft High... https://www.amazon.com/dp/B096CRXM43?ref=ppx_pop_mob_ap_share