Based on this comment:
I just noticed we’ve been defaulting sx1262 power to 17 dBm, but it can do 22 dBm. I’m checking in a fix, but it should help range a lot.
Similarly the more common rf95 radios were being limited to 17 dBm, but they actually can do up to 20 dBm. I’ve just checked in a fix so you can use that higher power level if you want. Though a caveat: the datasheet says not to use this higher power level without a limited duty cycle. In practice our duty cycle is fairly limited, but there is nothing guaranteeing that. Which is why I have these radios default to 17 dBm.
I haven’t checked regulatory limits for various countries, so you shouldn’t bump up this power without checking that yourself.