Ask HN: Best marketing strategy for freelance web designer?

Hi. I am a freelance web designer. My portfolio is at www.madebyargon.com

Currently I offer web design and user interface design services, my hourly rate comes to about $50. Most of my clients are web developers or web-dev agencies.

I am developing a marketing strategy that reimagines my service's four P's(product, price, promotions, place), and I could use some insight.

What kind of design service do you need the most? website design? ui design? iphone app design?

What is most important? aesthetics? usability? speed?

What kind of pricing do you prefer? hourly rate or per project? What is a good price point?

What kind of services would you value the most? unlimited revisions? 24-hour support? fast delivery?

Please let me know how I can improve my services to better serve my customers' needs. Thank you.