Plum tree pruning?




I have had my allotment a year now and it’s time to tackle the huge plum tree at the back of my plot!
I have taken some of the taller branches off as we have a height limit at our plot. But I am unsure where to go from there. As you can see from the photos there are actually 7 trunks. Should I be aiming for one?
Also I had so many plums forming this year that just shrivelled up and became lumpy. I have seen lots of wasps hanging around, would that be the issue?

Any advice greatly received!!
Many thanks
Leoni
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Why do you want to remove what seem to be perfectly happy stems? The tree looks like it’s growing well. Why spoil its fun?
I have a young greengage, the branches start about I metre from the ground.
@robdunford I don't think it is normal that is why I was a bit confused!
Thank you @purplerallim I will remove a couple of the trunks, some are crossing and rubbing each other so I will go for them
Fingers crossed for next year!