Hmmm… I don’t believe it’s Chakras either, but we have had similar things come up in the forum.
At first I had no problems with visualization, usually without even meditating, then it was harder while meditating, suddenly it only occurred spontaneously…
→ Still Nervous & Unsure
→ Meditation Goals
I was using Headspace at first but found another 1 that is much better that was recommended by my therapist:
That app has helped me so much & has meditations for literally everything including course types & you can pick the amount of time too.