Andy and Leslie have provided absolutely solid advice and I agree with them.
For the short-medium term I would also look at following the AirNZ lead on this.
If they are clearly signalling they will be positioning themselves as a domestic airline with future international options as the world eases travel restrictions then I think it would be fair to assume that would be a good mindset for you to look at how to position your business over the next 12-24 months.
The silver lining for travellers is that local tourism sector will be screaming out for cashflow and offering killer deals.
Look at aligning yourself now with local operators and getting the message to your existing clients that they have an incredible opportunity to see their own country like never before and experience things that the originally thought were way out of their price range.
This is a great way to look at reinventing domestic travel and those that sell this opportunity to the existing client base that traditionally took overseas trips will have a much greater chance of thriving.
Domestic travellers also tend to have a shorter lead time so this could improve cashflow.
Start talks with operators as early as you can so when NZ comes out of Level 4 and things start relaxing you are well positioned to take advantage of the timing when people will be looking at getting away from a home they have been cooped up in for weeks.
You could also start showcasing local travel destinations and operators now (without the hard sell) to get your existing audience thinking about local options and show that you are supporting the industry.
In short – be a leader not a follower and be ready to move ahead of the competition