I've only been here half a year, but I have read some archival posting.
It seems to me that a lot of times there is either a lot of fussy styling, or folks are all over the place style-wise when they first join. It is just that they are trying to communicate who they are, but they are doing it with a lot of stuff-- bells and whistles, and maybe even costumes. Then there is a swing to minimalism and simple refined lines as folks start to invest in better quality items, but mainly classic pieces. The wardrobe gets purged hard, not just edited, it seems. Everything that gets added after is an essential item, and basic or simple, but refined and better quality that what there was previously.
Once the hair, specs, classic pieces are in place, there is a slow swing back to that persons style persona. But, it is done with confidence and every addition is carefully considered, no matter if it is studded shoes, a colourful bomber, a body con dress, or a fringed purse.
This is just my general observation. It seems you might be doing a simplification as you wrap your mind around the idea that you want a grown up professional wardrobe.
Do keep the youthful joy of the quirky prints, though--in beautiful fabrics, and classic styles.