How can i make all my toes go straight?

Not by yourself: You can try stretching your toes upward and possibly taping them, but realistically you will need surgery to straighten the toes, there are multiple surgeries from a simple tendon release to a hammertoe repair. See your podiatrist as they will give you a more definitive answer, depending on how contracted your toes are.

See a podiatrist : You need to be evaluated to see if the problem is hammertoes and if they are fixed or flexible. Surgery may be the only answer.