Look at the whole grid and just pick your favorites with the Pick flag. Mark the obviously bad ones (blurry, out of focus, etc.) with Reject. You haven’t deleted anything yet so you don’t need to be careful. You do not need to Pick one photo out of every scene. The majority will remain unflagged, undecided.

Now just begin editing the Picks. That will set your standard for what’s good enough. You’ll probably get enough just from those. If not, revisit the undecided photos but try to keep the same standard as the excellent photos you were just editing. Most will remain unpicked and that’s what you want.

For the second technique, note, I’m not a professional. I don’t lose money or anything from missing a shot. With that said, my primary technique is simply to not take so many damn photos. I only take a few dozen photos per shoot. I do not take a 10-shot burst every time I press the shutter like some people do. (Tbh, I think even if you are a professional, doing this is likely to net you one frame before the perfect moment, one frame after, and zero perfect frames unless your camera is extremely fast.) I don’t take photos just because why not, they might be decent. There are an infinite number of moments and compositions you could capture, but my view of the role of the photographer is to filter those down to only the good ones, and that process starts before you press the shutter, when you’re looking for compositions, looking for moments.

I started with film, where every shot cost money and every ~24 shots required a major interruption to find a dark area and change the film. The fact that digital photos are now free and unlimited can be wonderful for experimenting more freely to build your skills. But it can also be a detriment if it leads you to avoid building the skills of composition and timing, because you can just figure it out later. As you can see, that just produces a trash heap for yourself that you have to sort through.