Been There, Done That: Time To Simplify

It really wouldn't be a brag to say that I've accomplished some of the things in life that were important at one time or another. In my years, I've had a lot of fun, just not very long periods of it. Here's a small list with the age of the wish and the age(s) of the act(s) -
1.) Fly an airplane (age 5) - finally flew (age 12), piloted a plane (age 15), alone (18)
2.) Sail on a sailing ship (age 8) - worked on a schooner (age 25) and square riggers (age 26 - 32)
3.) Be a rock singer (age 8) - formed a band (age 18)
4.) Work as astronomy artist (age 12) - sold first astronomy painting (age 25+)
5.) Be a writer (age 14) - NSS reporter-at-large (age 32), freelance (age 36+)
6.) Teach astronomy (age 17) - volunteer (age 25), full time (age 38)

I've done a lot. I've accomplished those big things, I just chose to move on from some of them (except for numbers 4 - 6, since they all tie together). So now, after all of this, what next?
How about settling down to the things I do best.
In short, time to simplify. In doing all of those things, I've developed interests vast and varied. Problem is, I live on a working man's salary, and as a result, have to live in tight quarters. I have too much. So, I have to thin things out. Will this be easy?
Can you say no?
Neither can I, and there is the dilemma. I need to. I have to look at a lot of this accumulated flotsam and decide. I've already done quite a bit, now it comes down to the tough choices. What do I really need? Have these things seen the light of day recently, if a while? If they haven't, there's the answer.
Change is never easy. But it is always inevitable.