How to negotiate (if I can even) when I asked for a specific salary and I got it immediately.

I did my research and thought I was putting a high number for my job title and salary. Once i got the job, they immediately took my number and added a signing bonus on top of it. That's great news for me and I'm excited to jump on it. Although, I wonder if I got any negotiating room at this point. Basically I gave em a number and It was higher than what I currently make as well as also what i thought is a tad higher than what i'd think but they took it and added a bonus to it.

Do I really have any wiggle room here or am i kinda stuck? I mean i kinda gave and i recieved. Maybe I pigeonholed my self and next time i should ask for even higher? Kinda happy that i got what I wanted but now im a little in i wonder if i could have gotten more.

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