@timkmak Um, you are following 4 people.
You can't sit back and expect people to find you and follow you. You need to engage, a LOT.
Follow 100 random people. Engage and interact.
Then follow 100 more. Engage and interact.
Do this about 6 more times over the next few weeks, and you'll find your timeline is rich, more people will follow you, you'll discover a lot of REALLIY diverse people, and you'll find some magic in here.
But you can't sit back and follow 4 people and expect it to be anything more than empty.