Okay, last year I had an overall TFR of 35 (so low!) and a lowish GPA too, but this year, I really revised my application and got an interview. I only added one even to my application but just completely revised how I wrote the others.
I will do a much longer post on this once applications open in the summer but here is a quick recap.
1. Use strong descriptive words and action words for your tasks.
I literally googled 'strong action words' etc when writing my entries and I found this very helpful.
2. Emphasize HOW you did an activity.
So they say in the help guide that they just want you to talk about your duties and what you did, but I think it is important to emphasize HOW you did it, meaning did you do it diligently' or 'enthusiastically'. It makes a big difference to say "I was a server at a restaurant where I greeted customers and I took orders" than saying "Enthusiastically acted as a first method of contact for customers, and effectively precisely rang in orders ensuring optimal service."
3. Descriptive pieces
Provide the reader with some description into your activity, whether that be quantitive facts "I worked with over 20 different individuals" or the name of a place you volunteered, etc.