There’s loads of currency denominations we could get rid of. We could probably just do away with the whole idea of fractions of a currency unit and just make everything 1 pound / euro / dollar
In the past a penny used to get you quite a lot, you might be able to have a meal out for a penny but now it’s literally worthless you need at least 50 of them to buy anything reasonable. No one bothers.
The UK used to have half pennies. But then the UK also used to have 144 pennies in 1 pound.