I have copied this post from one I wrote a while ago to a parent if a four year old..,.
Being wet at night is not considered a problem until about 8 years old,
It is due to the sufficient release of a specific hormone which is outside of a child's control
However there are things that can help....
Avoiding black currant drinks, and caffeine drinks (e.g. coke)
Drinking lots during the day (about 7 good cups)
Not drinking the hour or so before bed
Making it easy to go to the toilet at night (potty in room, night light on landing, etc)
Otherwise I would just stick with the pull ups for a while yet.
If there is still no progress with pull ups after a year or so then try without them for a couple of weeks.
I found it got to a point that pull ups were not really working anyway so we just double made the bed, used waterproof coverings, etc
With DS1 we saw the school nurse, then GP and then specialist continence nurse at around 8/9 years. We used medication then an alarm and he was dry at 10
Ds2 was dry at 3
Ds3 we just used the alarm at about 8 years and he was dry after a couple of months
A fab charity is EPIC who have a good website with information