I am not British, so I have no skin in the game. But the issue in general is not the fact that there is a head of state with a mostly-ceremonial role, it’s all the baggage that comes with the monarchy (detailed by others in this thread).
We'd just be switching for the baggage of an elected head of state and I'm not sure there is any stomach here for another issue that divides so deeply after going through the Brexit campaign/process.