Bold colors?

I’m in the process of crafting mock designs for my new client.

They’re an email marketing agency - and they want to somehow revamp the whole website. I’m not a dev and mainly just for design.

I find the colors a bit bold and lighting that up a bit can make it more pleasing to the eyes… don’t you guys agree?

You really want a live link to your client’s website that they can find with a simple web search? GDF ranks pretty high for returns on things like that.
Read the second paragraph here:
Welcome To GDF

What exactly is the brief? I’m not super familiar with their industry but at a glance it looks like they have a few color choices.

I’d have the serif font as the large text, and the sans serif as the small text.

For visually impaired, it could be an issue with the white text.