I saw NVIDIA as the next big thing due to AI 6 years ago back when their stock price was dictated by gaming and crypto. I was working for a hyperscaler and I wa

I saw NVIDIA as the next big thing due to AI 6 years ago back when their stock price was dictated by gaming and crypto. I was working for a hyperscaler and I was confident they were undervalued, along with Microsoft and AMD. And then I sold all 3 during COVID because I realized the exact problem you are saying - I had no idea when to sell and ultimately I was happy with my gains. Whoops I guess. Now all serious investing money just goes into index funds and I don't have to worry.