I can't stand most lets plays. I double cant stand lets plays of moronic indie games. Theres so many out there doing the exact same thing, and then you have ass clowns like KSI and Piew who just shout down the camera (avoid doing that).
You got a good voice though. If you play more AAA games and are good at them,go for those, especially MP (COD or Halo etc). They are often more enjoyable especially if you got a ESPN style commentary going on in the background. That will only really work if you are good at those games to begin with though. gd luck to you anyways.
And for the clowns saying ''dont talk in cutscenes''... if you wanna hear the cutscenes... go buy the damn game.
OP talk as much as you want, especially duing cutscenes. treat it like a stand up comedian. Any opportunity you see to throw a funny remark, if its not funny, hell even the recovery can be funny. When it comes to lets plays, people are there for YOU not the game. If they wanted the game/were interested in it, they would buy it...