3-5k is standard and just includes the website design. You can charge higher if they also require branding strategy, product shots (for e-comms) ect.

I am a UX designer and I charge 3-5 just for the designs. No coding. If you are doing both I would charge more. It would depend on the difficulty but if you are doing all of the above you can easily fetch 5-7k.

You are worth SOOOO much more than you are asking for! Don't sell yourself short.