Buying the Dip or Following the Trend?

I am trying to understand whether my strategy is correct as a two-year investor. I usualy open positions in stocks whose financials seem quite good to me, companies that are growing at a fairly good pace, but the momentum is negative and the stock price is falling, such as Google (at 150) or Amazon, which have brought me quite good profits. However, in general, I have not been very successful, as many times when investing in falling knives, I have found myself trapped (for example, Novo Nordisk). I thought I had entered at a good point, as it had fallen quite a bit, but it continues to fall further and further. Do you think I just need patience, or is it a better strategy to follow positive trends? For example, an investment in Sandisk a month ago would have brought me tremendous profits, but a similar investment in silver would have trapped me. **What do you think has a higher success rate?** Our main factor is time, and I am always talking about the **long term.** If I don't achieve anything special in the coming years, perhaps one solution is simply to invest in the S&P 500, which has performed slightly better than me over the last two years, where I could have achieved the same results without any effort.