@Natalie_FD 

You can't reduce your user licenses. You might consider renewing through a reseller and get $200 cashback to reduce the renewal cost.

are there any less expensive plans available that might still support our basic need

If you don't need to run any add-ons, you should contact @Fiat Lux - ASIA directly via email for advice. You may want to consider running the old QB Desktop with a non-subscription license.