I spent many years typing on the Microsoft Sculpt Ergonomic Keyboard (which is slightly different, with laptop-style keys), but it completely eliminated my typing pain. I can now type comfortably at about 120-140 wpm for hours on end with no discomfort.

Once they discontinued it, InCase picked it back up: https://www.incase.com/collections/productivity-accessories/...

Along with maybe what looks like a replacement for your old one? https://www.incase.com/collections/productivity-accessories/...

There are also copycats (of the Sculpt). Two that I've tried and liked:

HP 960: https://www.hp.com/us-en/shop/pdp/hp-960-ergonomic-wireless-...

Matias Sculpted Ergonomic Rechargeable Keyboard: https://matias.store/products/fk413d (small Canadian company, but they make an amazingly tiny USB-C dongle compatible with many of their products)

I ended up using the HP more than the others, preferring its keyfeel over the Matias. But both are well-built.

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If you don't want the mass-market stuff, there are also many companies making more hardcore ergo keyboards (two-part splits, vertical orientations, customizable keycaps, more natural/curved arrangements, etc.). But those typically cost multiple hundreds of dollars, rather than the $100-$120 or so for the off-the-shelf kind I listed above. And they just feel a bit too extreme for my tastes...