Spokes breaking at elbows, is classic for metal fatigue. On a well built wheels, of good materials that's a long way out unless the wheel sees extremely rough service. Otherwise it's eith poor material, or poor construction. The proof of is the tens of thousands of people who are able to put lots of miles on their wheels without issues, and the large numbers of builders who'se wheels last a long time.

Usually poor wheels are because of both poor material and poor work. Sometimes, if problems are corrected early (after the first broken spoke) the wheel can be saved, but if it's ridden until multiple spokes have broken then odds are the unbroken ones are also suffering from metal fatigue, and nothing can be done.

The things that separate good wheels from poor ones can be obvious like the a skilled hand builder vs. a poor machine build (I've also seen good machine builds, but most machine builders program the machine for a shorter cycle in order to speed production, so the quality suffers), spoke quality, plain gauge vs. DB spokes, etc. But other subtle factors can also doom wheels, things like flange thickness and shape, and how the spoke sits the hub can make or break a wheel.

As for why we're seeing more wheel problems today than 20 years ago, one factor is that wheel flanges are more asymmetrical today with 9 and 10s hubs, than they were back in the day of 5s. Flange asymmetry translates directly into spoke tension differences between the right and left sides. On many modern hubs that difference can be 2:1, making it difficult to get decent tension on the left side without overtightening the right. This isn't a crisis because good wheels can still be built, but it raises the bar moving mediocre wheels down to lousy.

The OP should visit a decent specialty shop, and have a decent wheel built. It's too late to save the existing one.