Things to try

If you haven't already, you might want to go back and Learn to use your robot

Try tape in a loop.

Try tape in a figure 8.

Can you make a part of a line that a robot will only run once?

Can you make a part of a line that the robot will never run?

Can you make a loop that the robot will run once forward, then again in reverse?

Can you change the program so the robot stops when it gets to tape shaped like a T ?

Can you change the program so the robot solves a maze? You might need to add a few more resistors and photo resistors. You'll also want to use the Wall Follower algorithm