What would be the risks of that? And the risks of keeping it the way it is?
From your perspective, you might find it even easier to sell your paid licences to companies and governments, if you use the AGPLv3. There's little downside to switching, because the AGPLv3 is still open source, and has similar compatibility with other open source licenses.
You've already released this under GPLv3, but you can switch going forward.
On govs, unfortunately, but I still think it's a benefit: governments can simply use it without purchasing a commercial license or using GPL, under the Polyform Noncommercial. They can definitely purchase support, deployments, and customizations tho.