10. Start another business. My only regret in business is not starting another one sooner! One thing youâ€™ll learn in life is that you need more than one income stream. Ideally, youâ€™d have three to four. It sounds like a lot, but itâ€™s really not. My youngest brother, who is 21, has at least four jobs at all times. Heâ€™s a student a Berklee School of Music, so he uses his talents to supplement his income. He has an on-campus job, offers private piano lessons and music transcription services, engineers sessions, and frequently â€œgigsâ€ at weddings and other events on weekends.