Definitely have some refresher lessons. I have three kites - a Crossbow 7, a Switchblade 10 and a Noise 12 (just replaced a Switchblade 14).
If you only have a 12 then consider not going out when the wind is above 20 knots. 25 would be a maximum. As you build confidence you will be able to push your wind range for a given kite up.
You can read about my experience and skills progression on my blog
www.peterskiteboarding.com/