My Monster tree in Hollywood, I had never done anything to it, and has taken up a big portion of the back yard, my guess its about 40-45 ft tall. last year I on one of my trips there I was going to try and rejuvenate , ( cut it down to a 6 ft high just leave a few of the main trunks and branches. that attempt was a disaster, I only managed to cut some of the outer branches. only being in town for a week or so, it was just too much work. some day will have to get some pro tree people to do the job, but will be expensive.
But the good news was that this year the tree responded by putting out tons of fruit. they were really good too. the size of the tree is not a problem other than, it is just a pain to reach any fruit from the upper parts.
The tree also seems to alternate, some years it does nothing, I suspect its because no pruning is done.