Do not fall prey of ineffective products that promise heaven but return zero results. Present evidence and elaborate it in your proposal to back up your claims.
You may be asked to craft a research or thesis proposal, project proposal, event proposalbusiness proposal, etc. Provide ways that will remove that burden.
You can use free digital templates for business planning to plan on your retail business. Use a positive tone of voice in your writing. It will make your proposal unique. Will it make their job more convenient?
Learn how to write your own plan just within a day without ever having to consult anyone around you. It's all about what and how well you use words.
Setting and understanding your client's problem will help you convince them that you are the right person to handle it. Stick to what you need to convey; let them stay on your page by keeping it simple and clear.