In situation X <environmental cue>, I will do behavior Y <concrete thing> to achieve Z <subgoal>.
Find that external cue for the behavior you want. That is, the cue you need for the desired behavior is the environment, so say “After X <environmental cue>, I will do Y <concrete thing> to achieve Z <goal>.”
For example, when this workshop ends in 30 minutes I am going straight to he library to read the 4 pages i need to achieve the subgoal of summarizing them for my thesis.