Aside from moving it / moving to a new one. Stuff that improves what you have.
Id:-
Knock through the lounge to a small room off it to make a lounge/diner.
Add a small shower room in the attic
Snazzy up the utility room
New kitchen (with wine fridge)
It's all generally in our plan (we can't decide if we would rather move instead) but it's all such a faff and an expense and it's really boring planning it all - so if I could just click my fingers and it be done, I'm in!