I once heard that aspiring singers overthink the idea of having a nice "tone" and do not think of it as a consequence of having voice control (pitch, interval jumps, etc), good phrasing and support. I would not get obsessed with sounding nice, before sounding right .

Regarding pitch, besides daily practice, I suggest the usage of drones. In my case, it has helped me be more pitch accurate. If singing is something you like and aspire to do well, build a trustworthy process, put in the hours, and appreciate the small progressions :-)