#3 Start Lacazette as a sole striker
Aubameyang's versatility should be used more often. His extraordinary pace helps him get past defenders with ease, and he did pretty well as a left winger before Emery decided to play as a number 9.
However, I feel Lacazette is better when it comes to playing as a sole striker, as his positioning is perfect. Of course, he is not as quick as Aubameyang when it comes to getting behind the defense.
Lacazette has always played better alongside Aubameyang, and they surprisingly share a very good relationship on and off the pitch, despite never having played together before.
If Emery gets back to using a 4 man defence, that would also increase the number of attackers on the pitch. It's true that they could concede a few, but GD won't matter if you can't outscore your opponents and bag all the points in the first place.