You are young slim & tall. You can wear things that will reflect that. I'm early 50s & the only thing you've linked to that I'd wear are the trousers!
And I love them!
I think you need to look at sites like Sezane, ba&sh, sandro, maje, anthropologie, me+em, &other stories, the kooples etc
Use these sites for inspiration & ease into it. When you change your style it can feel a little self conscious. But you can build to it.
I'd start with finding the perfect jeans. Build 3 outfits around them - a beautiful blouse from sezane & leather ankle boots, decent bag & accessories & tiu have a great non -office smart outfit for shoping / drinks / lunch etc
Same jeans teamed with lovely trainers & a great t-shirt/ casual top & a cool sweatshirt = casual everyday outfit
And so on. As you get used to the change you'll find yourself getting braver with colour, fabric, texture etc