The best replacement for ser is estar.

The best alternatives to ser are rated as following:
★★★★★  estar
★★★★  estar practice
★★  ir
★  sir
★  estar location
★  conocer
★  estar exercises
★  esta
  estar conjugation
  estar spanish
  estar weather
  estar conjugations
  openser
  ester
  ir preterite
  estar preterite
  seu

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Speaking about ser, one probably shouldn't forget about past participle.

Other search terms related to ser and their ratings are:
★★★★★ past participle
★★★ asterisk
★ descriptions
subject pronouns
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