Is following renowned investors good strategy?

I wanted to answer above simple question on basis of data, hence started working on it. I collected past 2 years’ public data of listed companies(market cap below 5000cr.) and noted if renowned investor(like Mr. Ashish Kacholia, Mr.Vijay kedia etc.) bought considerable stake into the company. I am not aware about data science much, but have simply plotted returns(same day, next day, next 2,3,4 days, week, month etc.) and expectancy of data points to get a sense of what maybe the best time period if one wishes to piggyback off of such investors. Please find sheet link below:

Appreciate if someone with data science experience analyse and provide their feedback on it, members opinion on it.
PS: It is not an investment/trading recommendation and I have done it just as learning experience. Thank you.