I'm still buying all the WotC 5e books—even the ones I'll never use much, such as the MTG settings. And since WotC's output has increased since the early 5e years, I'm buying more WotC than before. But I'm really buying a lot more 3rd party material than I used to, especially from DMs Guild, because while the WotC material is no better than it ever was, the quality (graphic design, etc.) of 3rd-party material has drastically increased in the past several years, in my view.