To all of us - Look at the man/woman in the mirror. Change begins with him/her.
From today, free yourself from tribal hatred/feelings/suspicions etc. Deal with everyone as a human being - not someone from tribe x. Analyze your daily activities and see if any of the things you did during the day was influenced by anything tribal. Take corrective measures immediately.
Don't worry about any tribal Kenyans you meet. It's not about them changing. First and foremost it's about you changing. You can talk to them but that does not guarantee they will change. And even if they don't, that should not stop you from striving to become a better human being.
Never count on making a good sale. Have the purchase price be so attractive that even a mediocre sale gives good returns.