Generally the higher frequency you go, the lower range you get as a rule of thumb. It's also harder to design around higher frequency boards, though it's totally doable. That said, I'd love to see how 2.4GHz works out!
Someone maxed out the ranging mechanism of the Semtech SX1280 with a 5dBi rubber antenna. He reached 60km with LoS. And there's a report of 90km in a ballooning project.
The latest generation of chips (AFAIR not yet released) integrated a mode that allows them to receive on all LoRa speed grades in parallel. Bit like the existing LoRaWAN basestation ICs.
I remember reading a datasheet that one (already released chip) is also able to work on 144-146MHz. But that's not what standard Asia (ESP32+LoRa modules) offer. TTGO has AFAIR recently released a super new board that allows this band.