Your emotions plays big when doing the trade, without good control and discipline you will be moved by the wind inside the market.
Never to act this way, the market is not favorable to traders who don't stand with their decisions, work more harder in reading the flow and make sure to decide only if you are really sure that you completed your study and research. In that way you are saving your investment and you are lowering the risk of your trade.
I guess that picking a lane and going there no matter what is usually something that works great in trading. Of course there are methods which are flexible, just because I said "pick a lane" doesn't mean buy and hold forever or something, it changes from method to method but there are many ones that "if x happens then do y but if z happens then do q" type of situations but at least you know what you have to do. Not knowing what to do and making a decision at that moment is the real killer for traders.
If you do that then you are going to end up with losing so much more money than otherwise, even if your method is wrong that usually means you could recover, but if you act without knowing what you are doing then you are going to lose a ton of money.