Question Regarding Self-inquiry...

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Hi. Leo in his video on "How To Become Enlightened" said that opening your mind before doing self-inquiry is very important.

Thing is, I've done the exercise he recommends to open your mind many times and as a result my mind got used to them and it doesn't open up anymore when I do them.

I feel stuck. Does anybody know any other good exercises to open my mind to the possibility that I may not know who I am? Thanks.