Lisa, I presume all of that was done with you consciously tightening your pelvic floor? Did they actually assess your pelvic floor strength and endurance (ie, physio uses a finger inside your vagina and you squeeze on the finger? This gives a really good baseline measurement of function, and it might be that you have great strength but poor endurance, or vice versa, and this determines what kind of exercise you'll still benefit from. I would recheck this every few weeks/every few months with my ladies, to measure the improvement and make sure they are still getting things right.

I've treated ladies who believe 100% that they're doing the right thing when they try to contract their pelvic floor, but when I actually have a feel, they're not getting it right still! That means that as many exercises as you do, you're wasting your time because you're not using the right muscles. (I'm not saying this IS the case for you, but it might be if you haven't been checked!) There might have been nerve damage which repaired to some extent over that first 6 months that things did improve, and it's plateaued because the nerve recovery is complete, but you're still not exercising the muscles to make them strong enough to jump, run, etc.

There are also little gadgets which you can use to exercise - vaginal cones are out of 'fashion' at present, but are still appropriate for some people, and there are several other mechanical 'exercisers' which variously increase the resistance to build strength, or give visual feedback so you can see how strongly you're contracting - and if you're getting it right or not. If you have a fairly good pelvic floor awareness and the ability to contract correctly, the electrical machines are less likely to be of benefit to you at this stage.

If the hospital wound up treatment according to protocol, as opposed to because they felt you were as good as you would get, you might be able to get re-referred by your GP back to the hospital, or find a private physio in your area who specialises in women's health, for a second opinion.