The best replacement for sm4 is sm5.

The best alternatives to sm4 are rated as following:
★★★★★  sm5
★★★★  588 rtx
★★★★  spin milled
★★★  tvd
★★★  200 series
★★★  588
★★★  mack daddy 2
★★★  sm2
★★  sv4
★★  sm5 vokey
★★  mp r12
★  gorge
★  cg15
  mp t4
  cleveland 588
  vokey sm3
  588 forged

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sm4
sm5
588 rtx