Hello @Tetiana Lavrenko (great project ahead :) ). Thanks for the clarification!
To your described scenario and specially because:
What important for us is how fast we can migrate and, of course, the price of the solution.
As per the blog post here: The Things Network and Azure IoT connect LoRaWAN devices
"The combination of both solutions, integrated in a matter of minutes, allows you to ingest The Things Network devices and sensors’ data into Azure IoT Central to be displayed, analyzed, and trigger actions in business applications."
I hope I could help you get started with your migration to the cloud :).