You can set up all your messages in a single path from their entry rules, with “If matched” arrows leading to the next block, making their messages always send in a consecutive order.

You can add “If not matched” arrows leading to later blocks if you want them to send in order, but have the option to skip some if the user doesn’t match for it.

Or, you can have multiple messages and paths links to your entry rule to allow all messages to send at any time, in any order.