Speaking as a physio who has worked in women's health, I would suggest the first step is having a frank and honest chat to the physio you've been seeing and ask the same questions you've asked here. Make it clear that you appreciate the improvement so far, but that you still want to get even better, and if you feel like the improvement has plateaued, tell her that, too.

You didn't say what format the physio has been taking over the last year, so no-one could say that you have a poor prognosis. I bet you haven't tried everything that a really good specialised women's health physio has to offer! It may be that you need to change your exercise type or parameters, (increasing reps or intensity, or doing exercises in more functional, upright positions instead of lying down, for example) or if treatment has mainly been passive (ie, the physio uses the machine on you to make the muscles work) then you may need to be moving towards a more active approach, (ie, you make the muscles work on their own without the machine's help.) If treatment hasn't changed and progressed over the course of the year, it's definitely time to progress! Feel free to pm me with more details of what kind of treatment you've been having, and I might be able to make further suggestions.

Depending on the physio's response, you might then decide to continue with the same physio, or to get a referral from your GP to have a chat with a gynaecologist about further investigations/diagnostics/treatments, or find a different women's health physio to take things further. Note that seeing a gynae doesn't mean committing to having surgery straight away. It can be very helpful to have a specialist talk through your options, some of which may well be applicable now, even if you're planning on having more children.