You had a great year 2020. What triggered your trade entries then?
Well, as been said many times, it's easy to do well when the market is on an uptrend, and I did. 75% of my trades were TSLA and all I did was to cash in every so often before jumping back in, without much concern for entries and exits.
I'm grateful for that year but 2021 has been the true trading lesson, trying out various methods against my tolerance levels. I am learning a lot (I appreciate the help) and my various questions are a continuation of that journey.
What I look for are repeat costly mistakes, which are always about mistiming entries or exits. When I go back and analyse, I'm often at a loss as to what I did wrong, yet repeats tell me it's not a fluke.
I have several examples of buying shares of a dropping stock, only to see it tumble further, then holding on to the shares for weeks until the stock finally surges well above my original entry, invariably 24 to 48 hours after I'd exited out of frustration or need for cash.

The alternative scenario is setting up a sell trigger $X or % above my entry before going to sleep, then seeing in the morning that the stock went to the moon.
I suppose I'm looking to find out if this is common occurrence among traders or if am I doing something wrong that I need to correct.
Scalping or intraday trading are a way to minimize these but which I find generally quite stressful to micromanage. Yet, the delayed gratification of swing trading can be just as taxing on the psyche.
In the last months, as I've come to understand that I don't need to trade every day, I've been gravitating towards fewer stocks, down to 3 to 6, 2 to 4 that I swing trade (5 days to 3 months) and 1 or 2 that I day trade (1 or 2 days max) although not all are clearly one or the other and do as they please (hello MSTR!).
By doing this I familiarize myself with the stock on a macro level, with its pace on a chart level and then on entries and exit at the trading level. It has helped me recover a lot of the losses I incurred earlier this year but I'm not out of the woods just yet with 6 weeks to go.