1. If you say "activities" in plural, then you need to say "these" instead of "this".
2. "Calmness state of mind" doesn't make sense. A better form of saying it would be "...to achieve huge power and reach to a state of mind full of calmness/reach to a calm state of mind."
3. "Intrigue" sounds a little odd for this sentence.
I hope it helps Hazem!