it is about a guy if memory serves me right was a thief) who dies and kinda reincarnate in the body of a fragile young noble who only his mother cares about, and he then learns that he can use ice magic
It sounds like something that might be found on royalroadl.com. There are a lot of stories that use reincarnation there.
Your best bet is to probably ask over at https://www.reddit.com/r/noveltranslations
They get these sorts of requests a lot and most are answered within a few minutes.
Here's the Royal Road forum for that stuff.
Agreed that the Royal Road community could probably help you out.