My advice to new or unprofitable traders

For context, I have been trading a little over 4 years now and have been consistently profitable. Now, as a part-time trading coach, Looking back, I was going in circle and did many beginners mistakes in the book. If there was one advice I would give my younger self would be to back-test more. Your back-test results are the fundamentals. This is key to improving your game. Over the years, I notice some of my students who quit before meeting me usually had no back-tests whatsoever. Look at the greatest big trading firms of our times. They all had the data to back them up, even the day traders at the prop desks. Feel free to AMA and if you want some advice on your trading, you can dm me but only if I have time. (My students get priority of course) TLDR Advice from yours truly is to back-test on a single proven strategy more, if you need some inspiration, I am here to help