The trick to getting PA perma is global recharge. This means picking up Hasten and IO sets with +recharge. With enough recharge, you can get hasten perma which means permanent higher global recharge. You probably won't have PA perma until you're ready to have a finished build at 50 with incarnate powers - which can help also with recharge. The trick though is slotting Hasten and PA with as much recharge IOs as you can when levelling up - so it is up often enough to make a difference. Besides, that Cold has really good debuffs so make sure you're using these on bosses and your team will thank you.
In the future you might have better luck with responses if you post a build and ask for help. Asking someone to give or make you a build is a time-intensive request. But people do like to offer pointers and advice if you put in some of the effort.