Before you go hire a business coach or sales person, enrol in an online course, follow a get rich quick scheme, do this first. Warning, this is a long list of things to do. No easy answers, no quick fixes, but the bare minimum of what you need to do before looking for more help. Remember, people hire who they know, who they like and who they trust. So time to get known.
Small Biz, Biz Dev
How to Get More Clients — The Futur
Knowledge
How to Improve Your Design Team’s Productivity — The Startup
If you want high-ticket clients, proposals make or break your business. Learn how to write a winner. Most of the time, people don't believe me when I tell them that it's 100% possible to close 80% (or more) of the deals you write proposals for.
Proposal
How to Write Proposals that Win 80% of Deals — The Startup
Jakob Nielsen's 10 general principles for interaction design. They are called "heuristics" because they are broad rules of thumb and not specific usability guidelines.