Congrats on finishing GF 1 & 2.  What you do next depends on your goals & skill level.  What exactly are you struggling with?

First & foremost, start learning songs you love.  You need to find something that motivates you enough that it is it's own incentive to keep practicing & learning.

So, learn the simplest possible version of a song.  Some way to get through the song form, even simplifying parts along the way.  Make a note of parts that are beyond your current skill level & set time aside to learn those skills or techniques.  Gradually add them in as you are able.

The Made Easy versions of songs are a great way to do this.

https://www.guitartricks.com/songs/beginner?sort=popularity

Be patient with yourself when working through the rock course.  Every guitar learner hits a wall.  Your skill level plateaus for a while & you have to do enough repetitious practice until those new skill become second nature.

Have a look at these tutorials on getting from basic open chords to playing them in a rock style rhythm.

https://www.guitartricks.com/tutorial/1492/

https://www.guitartricks.com/tutorial/1505/

https://www.guitartricks.com/tutorial/1553/

https://www.guitartricks.com/tutorial/1593/

And you can always sign up for a one-on-one lesson to get more personalized advice.

If you can give me some idea of exactly what you are struggling with I can try to point you in a specific direction!  Hope that helps!