For sure, it's very common for women to need doses of HRT adjusted. Usually younger women need more estrogen - for some reason, their bodies are wired to be getting more (as they would be if they had ovaries). So if you have a hysterectomy before menopausal age, you for sure can end up on very high amounts of estrogen, perhaps even double what you are on now. (Of course that needs to be done gradually.)
And then as women age on HRT, they often find they need less estrogen and still can feel great - their bodies seem to have dialled back on the demand for it.
So it is normal to need to adjust it through your life.
If you're currently on 100mcg of Estradot and you need more, 125mcg would be the next increase as it's usually 25mcg each time. That would probably be with a 100 patch and a 25 patch. Or you could have some 50 patches and cut half a patch to get 25 - and then if you need 150, you can do a 100 and a whole 50 patch.
Just to check - you didn't have the hysterectomy due to endo, did you? Just because if you had endo, the advice is to have progesterone as well - even if you don't have a uterus. This is because the endo may exist in deposits elsewhere and may be aggravated if you have unopposed estrogen....