Is there any way to stop being only interesting when first meeting

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Is there any way to stop being only interesting when first meeting people? I feel like I've mastered being interesting to people on the surface, I'm into a lot of interesting things, I do some sports, Table Tennis and martial arts, I read a bunch and can talk with someone about something more "cultured" things or just have mindless fun convos at a party. I even write and do some radio work. I've been told a lot that I have a charm about me. But after all that stuff wears off, I feel like I'm a boring as shit person. I'm certainly "interesting" at first and people tend to gravitate towards me but I can't retain that after a few months. It always devolves into mundane boring convos about work or something. I don't understand how to keep a friend. I feel like my childhood friends are still with me just because we are childhood friends and grew up together, now in our 20's.