@adc It's been quite a while since we've heard from you. Welcome back!
Playing in all keys becomes less of a challenge with repetition. Perhaps you could reserve 5 minutes of your practice time for addressing something that seems daunting, and use the rest of your time for what you're comfortable with. Eventually you'll absorb what once was difficult, and you'll move on to the next challenge. At the risk of sounding corny, I'd say don't bite off more than you can chew, but keep nibbling at something new.