In some stocks, there isn't a correct entry point. I have held Apple stocks since buying it at USD32.xx in 2010. Year on year closing, it keeps rising except for 1 year where year end close was slightly lower than the previous.
https://www.macrotrends.net/stocks/charts/A...k-price-historyYou have mentioned you are in for the long haul. Apple has been one of them. 10 years ago, even at USD32, my heart was pounding like mad when I bought 1000 units of Apple shares. And that at a conversion rate of 3.4x to every dollar. You have no idea on the temptation for me to sell every year. Even now, I am so very tempted, especially when conversion rate now is better at 4.1x. And now, Apple stands at USD320. Dare anyone buy for fear of dropping?
In reference to entry point, that only concerns short term gains. For long term, if you read their book value, one can be assured any dip will be momentary. Some you wait for them to drop, but they just keep rising. That is our loss because we dare not take the risk. I sold my ADOBE shares for a handsome profit just only 2 months ago. But look at the price now.

You can't win them all right?
I bought Facebook after they went public. And the stocks spiraled downwards to USD19+. I had a colleague who played the local stock market laughing at me. He's older than me by 16 years, so you could understand why he doesn't see how FB can be bigger. I sold it at USD189. And now?
Anyhow, I'm just sharing what I bought, kept and sold. There has been stocks where I have lost. But current holdings more than made up for the loss. Right or wrong is very much dependent how one interprets the market and economy, as well as understanding their risk appetite.
Yes but you entered the US stock market at the beginning of the bull run so your ability to weather storms and corrections is much greater than a new investor buying into these stocks at its current peak prices. I think if u had bought any of the top stocks in the S&P500 in 2010 you would have made handsome returns today. Its the same as the property market in Malaysia. Anybody who bought a decent property in 2008/2010 would have made a good return.
But as i mentioned earlier we are at the tail end of this bullrun. Its already so far extended. A correction is definitely on the horizon. When and by how much we dont know but it will happen. What i mean by trying to choose the best entry point is doing sufficient analysis and then making a decision. Nobody can time the market and the market will do what it sets out to do but we can manage our risk exposure.