The best replacement for dx12 is mantle.

The best alternatives to dx12 are rated as following:
★★★★★  mantle
★★★★★  dx11
★★★★★  x42
★★★★  x32
★★★★  dpx21
★★★  x12
★★  dx02
★★  dxl1
★  x41

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dx12
mantle
dx11