Botch up

(PW) make a mistake, ruin

I asked for her help with my watercolor painting. But when she decided to add some purple paint, I knew that she completely botched it up.

(MW)

1 : to foul up hopelessly —often used with up
2 : to put together in a makeshift way

— botch·er noun

(free)

make a mess of, destroy or ruin; "I botched the dinner and we had to eat out"; "the pianist screwed up the difficult passage in the second movement"

(Using English)

Meaning: Ruin or spoil something

Example: I BOTCHED UP the whole project and it had to be cancelled.

Botchy