I don't see why it's better to create a general portfolio app. Then what's the strategy to get new clients? I mean, the purpose of the categories is to have landing pages that rank on google and have good score for adwords
I get that but maybe put those keywords as examples of things you do. I'd imagine you want to take any design work possible so at least make sure you have an easy process to make inquiries. Also your pages are basically the same which just strikes me as kind of weird.