Most of the time we regret buying something when we see the price drop. Then we don't have any more dollars to buy. But if we divide our total dollars into three or four parts and buy slowly at each down, then the chances of profit are high. And if we get profit after buying first, then we will sell. For this reason, I think it is better to invest little by little instead of investing all the dollars at once. What is your opinion?
If you have done a good analysis before buying, then you should be confident in that decision, regretting the decision will only distract you and can lead to bad investment decisions in the future.
At least in every experience you have in investing, you must have experienced good or bad choices, learn from those experiences. I also see that you seem to have enough experience in that, by dividing your investment into several parts that you believe in, to get the profit you want.
When investing, we must have a strategy, both long-term and short-term. It's better to choose a long-term strategy, as it's much more appealing than a short-term one. If you have a clear investment plan and long-term goals, short-term price fluctuations shouldn't significantly impact your decisions.