Your solution is good, but is not possible in my application, the 2 TX devises are very far from each other.
in general, how to do if my neighbor uses a transmitter Lora has the same frequency as me?
Well, my answer was based on your description of the problem, which was lacking in a lot of detail.
So, describe what your project is and what you are trying to do. Describe it in a way that makes sense to us, terms like 'very far' and 'neighbor' presumably mean somthing to you, but the rest of us can only guess.
If the transmitters are also capable of receiving, not just transmitting (not familiar with that product, can't comment on this), they could wait for a time when they aren't currently seeing traffic, which would probably be good enough.
Being on a free frequency, there will be also some other transmitter that can send when you are sending (e.g., remote controls for automatic gates), not only LoRa transmitters, so the issue is wider. However, LoRa has good capabilities in signal discrimination. You may send packets with confirmation.