The best replacement for adventure time is regular show.

The best alternatives to adventure time are rated as following:
★★★★★  regular show
★★★  steven universe
★★★  my little pony
★★  gravity falls
★★  bravest warriors
★★  mlp
★  gumball
★  phineas and ferb
★  amazing world of gumball
  rick and morty
  my little pony youtube
  amazing world gumball
  muscle man from regular show
  futurama
  spongebob squarepants

Your alternative for adventure time is not listed? Suggest!
Speaking about adventure time, one probably shouldn't forget about finn and jake hat.

Other search terms related to adventure time and their ratings are:
★★★★★ finn and jake hat
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Google Trends

Scale is based on the average worldwide traffic of adventure time in all years. Click on graph for more.
adventure time
regular show
steven universe