Can I say "won't" instead of "wouldn't here?

Native speaker’s answer
Rebecca
I suppose you could! I think the tone would change, as "won't" is more definite and thus more serious and determined than "wouldn't." "Wouldn't" has more of a hopeful and promising tone attached to it. "Wouldn't" also flows well as a conditional since the line starts with "if." Ex: If you get in trouble with the school, there's nothing I won't do to help you fix the problem. Ex: There's nothing I wouldn't do to make you happy.