I always ended up buying high and selling low. It didn’t matter what I bought (my picks, brokers picks, dart board,...) it would fall as soon as I bought. There for a while I kept detailed reports in a bit of brilliance to offer companies to not buy their stocks. LOL. I was that bad at it. I really think I caused 2 recessions. Just me.
lol - I known the feeling. I tend to follow a few dozen big name companies that pay decent dividends. They all have ups/downs. I’ll buy some on a down, if it goes down some more, and the fundamentals are still ok, I’ll buy more.
A good stock that has had a downward P/E ratio trend is more likely to have some upside. ...just make sure there’s no red flags, like dwindling revenue, cash flow, or sudden increases in debt.
In general, I always make money, maybe not in the very short term but I usually come out well ahead in a few months. The ones where I’ve lost were riskier companies, lesser known - where I thought they’d be the “next thing”. For those types, you need to be a pro - there’s just no way to follow things close enough. I learned to stay away from them.