Killing has always been a little hard for Peach. My tips:
- Try to save your killing moves as much as possible, especially Fair.
- Try to get kills by edgeguarding.
- Aim your killing moves well. For example:
BLAST ZONE You Opponent BLAST ZONE
Now don;t hit your opponent to the left, but to the right where you opponent can die earlier.
- Get your kills close to the edges. It makes a HUGE difference.
- Don't freak out when your opponent doesn't die. Chill out and find a solution.
- Don't try to kill with a stale move ;l. Peach has more killing options than one.
Also:
16- Dark.Pch strat to kill better
Save your moves that you need for killing. Use lots of jabs, get damage off of grabbing. When you grab them don't always launch them so fast. Kick them a few good times then toss them. N-air cant kill so well so use that alot. Dair helps since its not a Kill move. Space dtilts. And turnips. Once you get them to a good % Now you can fely on your kills moves like Fsmash and Up smash. Your fair and bairs, even upairs. uptilt as well. Try to save your most important moves to kill. Cause when you get them to that good %, all of your kill moves will be at full power. And it will be less of a struggle to kill
But yeah, killing has always been a little hard for Peach.
People like to exaggerate though.