Get Balance of address and check < 5000 tokens?

Exactly! You can also use Autotask Condition checks for this. What you want to do is more or less the following:

  • Create a new Sentinel on Rinkeby that watches over the token contract address (not the address whose balance you want to check)
  • As @Skyge says, choose the Transfer event as a condition, and narrow it down by from == YOUR_ADDRESS so you only look for transfers of funds out of your address.
  • Set up an Autotask as Condition check that will be invoked by this Sentinel on every transfer out of your address, and check the address balance. If it's below the threshold, return a match.
  • And set up whatever notifications you want (Slack, Email, Discord, etc).
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