The best replacement for acrylic is gel nails.

The best alternatives to acrylic are rated as following:
★★★★★  gel nails
★★★  oil
★★★  polycarbonate
★★  enamel
★★  latex paint
★★  wool
★★  glass aquarium
★★  latex
★★  cast iron tub
★  enamel paint
★  cast iron tubs
★  oil painting
★  glass
★  lexan
★  gel
★  cotton
★  solar nails
★  polyester
★  plastic
★  watercolor
★  glass bong
★  shellac
★  lucite
★  oil paint
★  fiberglass
★  polycarbonate backboard
  glass backboard
  glass aquariums
  fiberglass tub
  fiberglass tubs
  cast iron bathtubs
  fiberglass bathtubs
  glass framing
  tempera paint
  wool yarn
  steel bath
  oil paints
  polycarbonate backboards
  silicone caulk
  porcelain bathtubs
  cast iron
  gel overlay
  porcelain tub
  cast iron bathtub
  fiberglass shower
  glass backboards
  natural nails
  composite bathtub
  porcelain dentures

Your alternative for acrylic is not listed? Suggest!
Speaking about acrylic, one probably shouldn't forget about gel overlay nails.

Other search terms related to acrylic and their ratings are:

★★★★★ gel overlay nails
★★★★ tips
★★★ palette knife
★★★ glitter
★★ glitter for nails
★★ watercolor
gel nails
gel medium
white tips
You have in mind a companion for acrylic and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of acrylic in all years. Click on graph for more.
gel nails