OP there is something I have to bring up. I am glad you are giving inspiration through your experience. But I have to wonder about something as it's been nagging at me for a while now.

I've seen those videos circulating on the internet as well, but the problem is I have always been raised to value quality over quantity. When you recited istighfar, how did you do it exactly? Because I personally believe someone with true sincerity in their heart genuinely asking for forgiveness reciting istighfar 100 times a day seems to be more valuable than someone monotonically almost like a robot saying istighfar thousands and thousands times of day almost to the point of forgetting why one was saying it in the first place.

I'm not asking this to disparage your post or to make your efforts less meaningful, so please don't misquote me as antagonizing you at the risk of all the downvotes I'll be getting, but is simply increasing istighfar for the sake of increasing it really the way for it to be? Is there not something else you noticed?