A lot of good advice here, especially “you just gotta shoot long range to get good at shooting long range”.
So I’d say just get to those spots that let you go farther whenever you can. That said, in addition to working on fundamentals, one thing that helped me immensely when my main access was a 200 yard range was shooting a 22 lr with subsonic ammo. Not exactly the same but you can learn a lot about drop, wind, and small mistakes being amplified at distance by shooting a 22 rimfire at 150-300 yards.