Another post with an answer that is not really "correct" - the question you want answered is
a.) how can you downsize excessive licenses?
b.) when can you do this?
the answers are that it is possible to do as an Admin, from https://adminconsole.adobe.com/ but only if you're in the 30 day renewal timeframe.
Go to the Account tab and scroll down - do you see a Renewal box? That is the ONLY time you can actually do this - you have to be less than 30 days from the renewal date, and you probably will only be for sure in this window if you've received an email called Updates to your Adobe plans.
So if you have this option, you can find the "UPDATE PLAN" blue button and that will take you to a new portal which actually allows you to downsize your seats (or get more if you are a successful company making tons of money and life is good). In each section on the right you will see how many licenses you have assigned and total, i.e. 5/7 Photoshop means you are only assigning 2 and have 5 that are wasted. Click the widget below to lower the "Renewing Licenses" to what you'd like.
Notice the very large monthly savings, and feel good that you finally made it to this post to get a real how-to. ❤️