Could you wear smart sandals with a small heel? I like sandals with a big heel myself, but that’s not for everybody. Varnished toenails.
I prefer summer for work clothes. I work in one of the professions, but everybody is more casual at work than we were 10 or 15 years ago. Nobody wears suits any more, for example.
Get some slim ankle grazer or cropped trousers in black, navy and grey (M&S and Gap are good for those). Then find some plain or subtly patterned tops. I wear sleeveless stuff because my arms are good, but you can find smart, fitted t shirts and shirts. If you stick to neutrals with the odd bit of colour, e.g. a red top, it is easier to look polished.
For over the top, if you need it, I rate Uniqlo merino cardigans or a lightweight blazer.
Good work dresses are a rare find. I’d look at darker colours, a high-ish neck and a small sleeve. Boden do some ok things. I prefer a skirt and tailored top: easier to flatter your body shape.