Agree that moving up as you did on the right is fine if people are making enough room. It's common.
It's good to learn to move up within the pack too. There are ways of filling the gaps as if you're a liquid drawn to the front.
Lastly, I'll often move up just with some power when things string out. It doesn't take much out of me to hop out when things start getting strung out, and just hammer up to the front. The last time I did this, things just didn't feel right mid-pack, and right when I arrived at the front, the winning break took off. Luckily, I had the position and the legs to join in and benefit. I know a lot of people will really fight the urge to just move up the side in the wind (when there's room -- which is only when it's fast), but it is more expedient.