An automation can pause (wait for a reply or a delay) at most 10 times.
To keep conversations from running forever, one automation can have at most 10 Wait for reply, Ask a question and Delay steps in total.
Remove some waiting or delay steps, or split the conversation into two automations (the second can start when the first adds a tag).
Still stuck? Send AVX-3172 to hello@theavoxai.com along with what you were doing when it happened.