What evidence do you need? I have no 'successful clients' because I have just started offering my services. Previously I was helping bodybuilders for free. I wanted to help you too but you thought I was a scammer instead.
I understand that you have no clients, but showing clients was just an example (duh!). Why not a web page with contact info (not just an email address), your bio, a resume, your certifications, etc? Is it so hard to understand that you need this?
You can't build a name by simply joining a forum, and like I told you, Getbig doesn't even allow you to do those things (terms of use).
If I want serious help for a contest prep or whatever, I want personal help, not e-help (with all respect if(!!) you are as you describe yourself).
I'll end with this, have a good day Jon.