This low-growing (1’ish) evergreen was compact when we moved here 10 years ago. It’s now about 6’x4’. Can you tell me what it is, and what is the best way to reduce

it without killing it?
Carmarthenshire
If at first you don’t succeed, have some cake.
Posts
It's a good evergreen to have in your garden as it maintains interest throughout the darker days of the year and also 'partners up' well with Spring/ Summer flowers and bulbs. Good in flower arranging too.
https://www.rhs.org.uk/plants/97545/Euonymus-fortunei-Emerald-Gaiety-(v)/Details
They're very versatile, and will often grow vertically if against a wall or fence.
They grow generally in a mound, but that's also dependent on how, or if, they've been pruned, and your own growing conditions etc.
I live in west central Scotland - not where that photo is...
Very tolerant of shade.
Given support it will even climb.
Always looks clear and fresh.
Can be hard pruned.