I've found a great number of topics about this, serveral more than a year old.
I've kinda found all the songs/artists I like, well over a 1000, across various genres. When I want to discover something new, I use the discover-option. Most of the time I'm perfectly happy with a genre based mix of the songs I know and love. Where the daily mix is perfect for and worked great when I started using Spotify (and kept filling it). It's great as background music during office hours, some hardrock for productivity, something more mainstream to get along with colleagues, some cheesy Disney-style songs when in a good mood, etc.
But now... the daily mix is not changing anymore. Always the same songs, in the same order and only a few out of all the songs/artists I liked.
Idea: make the daily mix shuffle daily again?
For everything else, there is the option to save it as a normal playlist to tune/tweak it further...