Changing the interaction order

Hello guys,

I have created a bot with 19 interactions already. But, now I want to include another interaction right after the first interaction and want the first interaction to fallback to this new interaction. I tried adding a new interaction at the end and connect it with the very first interaction, but it's messing up the bot. The fallback option is not working. So I want to know how can I add a new interaction between interactions.