I'm afraid Atlassian don't offer anything between those two tiers. A long time ago, you could "add" users, but the licences moved to tiers many versions ago, and there is nothing between 500 and 2000. (1000 would be sane and logical, but it's not an option at the moment)
G’day everyone! Super exciting news coming from the Marketplace. We have now fully rolled out the ability for end-users to submit app requests to admins directly from within the product! No longer ...
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