You might have a look at C.S. Friedman's "Cold Fire" trilogy. Several of the main characters are quite powerful sorcerers right out of the gate.
https://www.goodreads.com/book/show/36159.Black_Sun_Rising"Tigana" by Guy Gavriel Kay also has some fairly powerful POV sorcerer characters, although the MAIN main character isn't a wizard at all.
https://www.goodreads.com/book/show/104089.TiganaThanks will google them.
One of my favorites, it has 7 books in total and that is the Witcher series.
The first thing I loved about it is its maturity. It doesn't mind being brutal and doesn't shy away from sex.
Also the development of characters is done in a great way.
Apart from that my second favorite series is the stormlight archives by Brandon Sanderson.
Expansive world with many cultures and different people.
Also enjoyed both series.
