Yes, you can become paralyzed forever, but only if you suffer a major spinal injury. In other words, no. Not in SP.
Your body naturally paralyzes you every night so that you don’t reenact your dreams. Sometimes there are malfunctions with this, hence sleeptalking and sleepwalking can occur.
As for your technique, I’ll send you here. Get 4-6 hours of sleep before trying WILD if you aren’t already.
Also, I want to gently remind you that WILD isn’t for beginners, and if you don’t have much DR then WILD won’t help it improve. Whatever you really want to do, though.