Set yourself a reminder to review your business plan regularly. If you have a team in your business, holding brainstorming sessions is a good way to benefit from their knowledge - it ensures you are all on the same page and that you get their support.
If you don’t have a specific immediate need to show a formal business plan to a banker or investor, then you are probably better off doing just a lean business plan, for your internal use only. To make the best impression on banks and investors, your business plan outline should be presented in the standard business plan format.
While every business owner should have an ongoing planning process to help them run their business, not every business owner needs a complete, formal business plan suitable for submitting to a potential investor, or bank, or venture capital contest. So don’t include outline points just because they are on a big list somewhere, or on this list, unless you’re developing a standard business plan that you’ll be showing to someone who expects to see a standard business plan.
A business plan is a living document that maps out the details of your business. It covers what your business will sell, how it will be structured, what the market looks like, how you plan to sell your product or service, what funding you’ll need, what your financial projections are, and which permits, leases, and other documentation will be required.