Play to your strengths and team up with complementary players

Designers come in many shades but it is pretty (in fact extremely) rare that they cover all 3 pillars required by most large projects:
- Behavioral
- Visual, and
- Technical
Understand which point(s) you are able to cover best and team up with talented people who shine in the other points.  Knowing where your abilities end and another's begin allows you to relinquish responsibility for things that you may not have had ultimate control over anyway.