Get a rebuild.

If you can afford a better and stronger rim - double-wall with very thick center line, or eyelets or double eyelets. Velocity, DT Swiss, Mavic, plenty of choices out there...

Double butted spokes would be nice. Brass nipples...continue with 2X lacing.

Whether you have it done with cheap spokes or quality spokes, it is very important that the wheel build includes stress relieving which is easily accomplished by a very strong pair of hands with gloves squeezing parallel pairs of spokes on both sides for two rotations of the wheel.

After a final true, dish AND stress relief cycle - and the wheel holds true - it's ready.

Since this is likely a symmetrical IGH rear - try to get the tension up in the 95-107 range which is what I typically aim for.

Most important thing to remember most of all is the following:

IGH hubs tend to FAR outlive the other components. FB and others here can probably tell you stories about IGH hubs that have outlived their OWNERS!!! You will wear out rim sidewalls, you may even break a bunch of spokes again 100,000 thousands miles later...

It's not a reason to be down on yourself, it a reason to be proud of yourself for getting a good return on your investment - and then do it again with another rebuild.

=8-)