/fa/, I need to start dressing like I'm in my 30s. No, I'm

start with well fitting essentials in colours like khaki, olive, black, burgundy, white, such as jumpers, tees and turtlenecks. Develop an understanding of your personal style and tailor your wardrobe to that with the cuts that firstly suit your body best and secondly are most aesthetically pleasing. I'm assuming since you were wearing graphic tees you like to stand out at least a bit so consider more interesting silhouettes ie. layering, oversizing, wide leg cropped trousers, things of that nature. And lastly one of the more important notes is to build a solid wardrobe slowly. Spend more on fewer items and over time accumulate pieces you are excited to wear and show off. Buy high quality, long lasting pieces. Best of luck in your journey!