What do people who have developed resistance to Botox do?

I heard that if you get Botox regularly, you can develop resistance at some point.

In that case, it's true that the Botox won't be effective even if I get it, right?

What should I do if I develop resistance to Botox?

Will it be okay if I rest for a while and then get Botox again?

How can I manage this without developing Botox resistance?