I have inventory in an Amazon warehouse.
Yes — you can switch your Amazon seller account from Professional to Individual, but Amazon rarely makes it easy because they’d prefer you stay on the plan that earns them the monthly fee.
Here’s roughly how things work: go to Settings → Account Info → Your Services and try to deactivate the Professional plan.
If Amazon allows it, your account will downgrade at the next billing cycle and you’ll be charged per-item fees instead of the fixed subscription.
However, some sellers report that Amazon refuses the downgrade if they have certain active tools, open cases, or pending orders, so you may need to first clear those issues (close open returns/claims, cancel upcoming campaigns, make sure no active services require Professional plan).
If Amazon blocks the downgrade, you can ask support to “reset billing plan” but there’s no guarantee — it’s largely a matter of timing and whether your account status meets Amazon’s internal criteria.