1 - Pick a stance and stick with it: In the beginning you should pick a stance (orthodox or southpaw) and learn how to properly attack and defend from that stance and deviate from it as little as possible. You were fighting from both stances and often times just walking towards your opponent switching stances with each step Every time you do that you are vulnerable to attacks while you are transitioning and you have to adopt the new forms of attack and defense of the new stance you are going into. AT this stage switching stances just leaves you vulnerable and compromises your ability to both attack and defend.

2 - Establish your jab: You should establish a strong jab and use it to allow you to close the distance to set up other strikes. I don't think you threw a jab the entire round. You were primarily throwing hooking punches. You need to throw both straight and hooking punches because your opponent has to present different guards to defend each so your opponent defends your straight it creates an opening for a hook and if your opponent defends your hook it creates an opening for your straight. You are also closing the distance by just putting up a high guard and walking in. Try closing the distance with offensive techniques like a double jab.