You may need to replay some levels a few times before learning the steps and best path forward to get those three stars. But here are some tips I found while playing.
After you get stop time skill that is the primary skill i used for the later half of the levels. Because of the way skills charge i found it advantageous to wait for the one to fully charge and then use the worker speed and just kept doing that. Finished the later levels with ease not having to replay any had plenty of time to spare for all levels.
Before starting the level look at the map and try to get a sense of the resources needed to complete the level. If it is a level that is going to require a good amount of wood work on upgrading the sawmill first. Same goes for food or stone. If you have a farm that only puts out 1 food ignore it unless you have a worker doing nothing.
If you have to restart look at what resource you have plenty of and when you restart don't build that resource up right away focus on something else.
Use skills I found myself getting into a grove on the map and forgetting them and they were charged for awhile before i noticed.