Remember that he's just a baby still... and you wouldn't look at a five year old child and say "Why can't you entertain yourself?" Neither has reached the time in their life where they calm down and act 'mature'. My best suggestion is just to enjoy this kitten time while you have it! It might sound crazy now, but you will miss it one day.
Remember that if your training isn't working, it's not the cat that has a problem, it's the training methods! Luckily there are LOTS of things that you can try.
Put those breakables in a box and pack them away for now. You don't want them to be casualties to Trey as he learns what not to get into, and that way you can focus on what methods to learn to teach him, and not which of your precious valuables he's knocking over!
Saying "no" doesn't really work on cats. It can make them fear your voice, too. And if he only stops when you move toward him, he will figure that he can get away with it when you aren't there! One thing I do with my cats to instantly stop a behaviour is clap my hands once, loudly, then look away like it wasn't me. They'll associate whatever they were doing (eating a plant, or some cables, climbing on the counter, etc), with that scary loud noise and that will stop the behaviour. Don't overuse this, though! If you do it for every little thing you don't want him doing, he'll become really paranoid and jumpy.
Good for you for having so many cat toys! I'd definitely suggest going to a dollar store and picking up some of those interactive toys. The ones with feathers on a fishing rod will wear him out REALLY fast and you can swing it around while reading or watching TV (though its fun to watch him jump too!). I always kick the cat toys around for them or toss the toy across the room for some chasing. It doesn't really take you away from what you're doing, but it gets your cat playing (toys are more fun for cats when they are moving).
DEFINITELY get him a cat tower. Something that he can physically climb on and get off the floor. It doesn't have to be 8 feet high (they can get really expensive and huge!), but if it gets him off the floor it will save your sanity. It's in their nature to climb! You can either have him climbing all over your house, or climbing on his tower... your choice.
Please let us know what you've tried of our suggestions and how they worked!
PS: Same thing happened with Pixel, our newest cat. We thought it was a male, but turns out she's a she! You'd think that identifying the gender of a cat was Vet School 101.