Offer arrived, can I still ask for more? - 10 months and counting

It is the first offer in 10 months and I do not want to mess it up. This is my first time dealing with any of this. The benefits are decent. Did it backfire?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

Ask about the range, not a number on its own. It felt more collaborative.