alright
1. you need to space fairs better. ur fast fall single fair approach is good, but should not be used in all situation.
2. concentrate on fastfalling nairs with proper spacing.
3. at zero percent you can grab peach throw her twice to rack up damage then do nairs to safely shuffle without retaliation. If you double fair, the peach can nair out if you are not properly spaced.
4. ur dair edgegaurds were a bit weak, but what u are doing is possible, just wait for the umbrella to be out and do reverse dairs.
5. at around 80 percent you can forward throw to wave dash fsmash tip.
6. you can up throw to uptilt, or shffl uair to tilt and continue to combo.
just work on spacing and tech skill and ull do just fine.