Award Travel Question

Hello,

Going from US to Asia via Doha. Trying to book award travel in Dec on Qatar and seems very difficult now.

While using the app, there are no seats available. However, when I break down the trip,

• From US to Doha is available but at Flex
  
• From Doha to US seems to be available Economy
  
• to and from Doha to Asia is only for Business Class
  

The question that came to mind is if QA releases economy seats closer to departure date. Guess everyone has asked this and there is no good answer. :-)
Wondering if I should wait for more economy seats to be available or bite the bullet and use nearly 2.5x the points - first Flex and then business class from Doha to Asia and back.

If one books trip from Doha to Asia from USA, are there anything that one needs to look at? Cancellation charges or Date Change charges.

Am still not sure if QA allows for date changes (for return trip) Once Trip has commenced. There seems to be some confusion. Even QA Customer Service is providing conflicting answer lol

The final twist is that I got award tickets earlier this year but HAVE to change dates, However, am told that there are no seat for the class (basic economy) available at all. And if I need to make another booking then I Need to cancel existing award ticket to have enough miles to get the updated award ticket.