I (F19) want to reconnect with my stepbrother (m17) but am struggling to. But how?

I’m going to my freshman year of college and am quite pained to say I drifted from my stepbrother since when we were younger. It can be attributed to a couple things— me falling too much into hanging with my friends and studying/college admissions, me working, and not living together/me not visiting as often as i should/could have (I’m kinda uncomfy in the house he lives in bc i have weird dynamics w stepparent). I miss our relationship. I’ve let him know to reach out to me always and I want to stay in touch but like… we don’t really talk much outside of when we see each other as is. I don’t know what to speak to him about. And when I’m around he’s kinda nonchalant/on his game. I don’t want us to be uncomfortable around each other as adults and I had such a difficult time with college admissions and stuff and I want him to be comfortable talking to me. I let him know I’d love if he reached out and called me no matter what during college but yeah the conversations we have now are pretty dry. How do I foster reconnection, especially being I’m only going to really be home during breaks and long weekends.