Some more great advice, this time in the form of 50 things every graduating design student should know, but I find this stuff just as applicable to those who have been out of school for a while grinding it out in the 'real world'.
A couple of my favourites in particular:
50. Don’t take yourself too seriously. Take your work seriously, take the business of your craft seriously, but don’t take yourself seriously. People who do are laughed at. #the50
Fact. Don't be one of those designers.
47. Share your ideas. You’ve nothing to gain from holding on to your ideas; they may feel precious, but the more you share, the more new ideas you’ll have. #the50
This is so true, the more you share the better off you're likely to be. Ideas are useless without execution anyway. If someone is more passionate about your idea then you are, you're probably better off.
45. Be an auteur. Regardless of who you’re working with, speak up if something’s not right. Take it upon yourself to be the barometer of quality. #the50
I've been guilty of this a lot in the past. I'd fold faster than Superman on laundry day for ridiculous client requests that hurt the project, because I really just didn't care about the work. It really comes down to genuinely caring about the work you are doing.
38. Do not underestimate self-initiated work. Clients get in touch because of self-initiated work. Ironically, business is excited by ideas untouched by the concerns of business. #the50
Lot's more great advice in the full list, definitely recommend checking it out.