Well when it comes to apply your new skills it's very useful to start improvising and including those new techniques even if you don't feel ready yet. Because it's easy to play a scale fast, but if you don't know how to use it in a song, it might not be useful! So you can add them, as they already said, in a song, or you can use them while jamming, and that will improve your new skill and also your jamming technique.

I hope this helps! =)