Meaning 2.0

I unfortunately just deleted everything I was writing somehow but hitting a button on my keyboard. I was talking about how I am so incredibly tired of my ADHD and going from one thing to another. It pains me as a creative because I genuinely want to put SO MUCH content out there. I love space, comedy, and education so much, and I want to get other people excited, laugh, or even educate them as well. It sucks sometimes because I am told I am smart, yet I cant stick with anything. Years ago, I loved astrophysics, so much I changed my major in college to it. I listened to podcasts, read articles, and followed a ton of space phenomena on social media all the time for three whole years. Then I fell out of it, the longest I was ever interested in something, gone, down to a small hobby I check in the space from time to time. 

How do I stick with something? Now I barely keep my attention for a couple weeks before moving on. I want to be consistant but eventually I learn or have done something enough that it no longer interests me. What do I do and what does that mean for the longevity of my brain, my life, and my purpose?