Review the last exchange
Check the scope, document sent and agreed next date. No universal delay suits every quote; a missing response may mean a question or a timing issue.
Ask a useful question
Refer to the proposal and ask whether a point needs clarification. Offer a simple next action instead of repeating the same message.
Assign an owner
Keep a quote reference, sent date, last exchange, status and next action. A reminder is not acceptance of a quote.
Automate gradually
Begin with an internal reminder or reviewed draft. Stop on reply or decision, show failures and duplicates, and require approval before changing price or promising availability.