Ok, well it's largely opinion but I'd say unless really quiet emotional stuff is your thing you'll need to build up a lot of strength to compete/perform with a band.
I know you'll probably have a mic to amplify you but still, your voice is very weak in these demos.
I said in your other threads that I'm no vocal coach, but I work with a guy who has this tight restrained voice through habit.
He's damn good at impressions so I encourage him to impersonate Sinatra in his free time.
Without even really thinking about it, the techniques start to translate to his normal singing very quickly.
Another tip is to rehearse with a confident singer, if you know one. Often the fact that someone else is there encourages your A game, and also you'll start asking yourself why you're being drowned out!
If I tell my pal to sing loud and strong he just kinda struggles and shys away, but if I open it up and sing over the top of him, all of a sudden he finds some strength.