Congrats on finishing the course!
I think rather than focusing on specifically showcasing tidyverse skills, pick a problem/project from Kaggle and try to replicate it but in your own style.
Or if you’ve come across an interesting paper, re analyze the data using your own methods.
Don’t worry about learning and completing projects all at once. It is a curve and take it step by step and be patient.
As a first step, maybe create a personal website first? You will learn a whole lot just by that. You can use blogdown in r to make one.