Well, congratz. If you have fun currently, you could try harder stuff (like Normals + DT or whatever you find challenging). I believe you shouldn't be afraid of pushing further.
On topic, my first top 50 was https://osu.ppy.sh/b/257334&m=0 (Hard) with DT + HD and it was exactly rank 50 some months ago. My second and last top 50 was another exact rank 50 on https://osu.ppy.sh/b/404477&m=0 (Insane) with HD. Of course, I'm out of those since some time has passed.
It was pretty satisfactory, but since I didn't really try it wasn't too special either.
Of course I could be lying since I didn't prove it, but I'm too lazy to do so.
TL;DR I'm a filthy liar.
On topic, my first top 50 was https://osu.ppy.sh/b/257334&m=0 (Hard) with DT + HD and it was exactly rank 50 some months ago. My second and last top 50 was another exact rank 50 on https://osu.ppy.sh/b/404477&m=0 (Insane) with HD. Of course, I'm out of those since some time has passed.
It was pretty satisfactory, but since I didn't really try it wasn't too special either.
Of course I could be lying since I didn't prove it, but I'm too lazy to do so.
TL;DR I'm a filthy liar.