The best replacement for ipa is pale ale.

The best alternatives to ipa are rated as following:
★★★★★  pale ale
★★★  apa
★★  app
★★  lager
★★  double ipa
★  ale
★  stout
★  medical group
★  pho
★  epa
★  ipl
★  esb
★  international phonetic alphabet
★  dipa
★  aco
★  ipa
★  integrated medical group
★  pmg
  pilsner
  hefeweizen
  acetone
  grounded theory
  denatured alcohol
  india pale ale
  100% ipa
  mso
  amber ale
  imperial ipa
  methanol
  lagers
  wheat beer
  .app

Your alternative for ipa is not listed? Suggest!
Speaking about ipa, one probably shouldn't forget about belgian yeast.

Other search terms related to ipa and their ratings are:
★★★★★ belgian yeast
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Google Trends

Scale is based on the average worldwide traffic of ipa in all years. Click on graph for more.
ipa
pale ale
apa