Cast Iron 45yrs old Flange broke

We have had plumbing problems for 15yrs now it kept leaking from the bottom of the flange onto the basement floor and the last time we took apart the toilet we noticed that the top of the flange by the screw hole was chipped and looking closer a 1 /2 piece broke off so we picked up a pvc flange that will go over the spot but now the new flange is sitting higher so we had to build up the floor around toilet and I'm tired of stubbing my toes everytime I go to the bathroom is there any way we can replace that piece
again so my toilet is level?

Sure is. Any real plumber can quickly remove the old flange and properly install an new one. What you have now is disaster waiting to happen.

A plumber would likely take the old flange off, and lead in a new one. This is the sturdiest, best option.

A DIY'er is unlikely to have the tools or skill to do that.

There are alternatives.

Depending on how much room you have below the floor, you could rent a snap cutter, cut off part of the vertical riser, then use a no-hub connector (reinforced rubber band coupler - screw clamps tighten it to seal) and a new short piece of pvc and then a new pvc flange glued to it. This all depends on how much room you have. If you don't have enough vertical distance to do that, you'd have to cut back more. Just replace the elbow and whatever else is necessary with PVC (or abs, if that's what your area uses).

Option 2, not as good, you can buy a cast iron flange that either fits inside the existing pipe (need to clean it up and only if it is 4" ID), that has a gasket to seal. Tighten it to expand and seal, then screw the flange to the floor. Or, if it is a 3" pipe, take the old flange off, then install one that has a gasket designed to clamp around the outside of the pipe.