How to write copy when not focused on a niche?

I'm reaching a book called Copywriting Secrets. In that book, there's a chapter where you have to define a F.R.E.D, which basically means your ideal customer.

But in the web design industry, I can help anyone I want. For example, I can setup online shops for retail stores, building lead gen website for construction companies, build brochure websites for lawyers, and so on.

So, when writing copy for my website or public profiles, how should I approach this? Do I use common problems that...

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