Why do some people not improve is the question in another thread. I do not improve because I play suboptimal moves like Mi Yuting

When I take a look at my own games I frown at moves like b instead of a in my own games.
- Click Here To Show Diagram Code
[go]$$Bcm25
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . 1 X . . . . . . . . . . |
$$ | . . O . . X . O X O . . . X X . . . . |
$$ | . . . O . . X X O O . . . O . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . a . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . b . . . . . . . . . . . . . O . . |
$$ | . . . O . . . . . , . . . X . , . . . |
$$ | . . . . . O . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
Gu Zihao 9p vs. Mi Yuting 9p; 2020-09-17; 22 Nongshim Cup, Chinese preliminary