I hesitate to say I've gotten "good" at anything musical, because that implies there is an objective bar somewhere. I have gotten "good" enough at arrangement and production to have tracks passed by the panel here (and that Yoshi collab with Timaeus is a DP!), so I'm quite pleased with that. Yeah, that collab was a turning point for me too, and it remains my favorite track I've ever worked on.
As per the feedback I get, I seem to have some decent arrangement ability. As for production, I'll say it is getting better, and I feel this is true when I send a track to five people I trust very much and they send back only minor crits. This just happened on my latest track I wrote. I'm pleased with that, it tells me I'm moving in the right direction, but it's not gonna make me lose my humility anytime soon. I just try to keep everyone's crits in mind, and try not to make the same mistakes again, while at the same time always trying new things... things I haven't tried before, things I'm scared of or feel incapable of. Why not, try everything.