One helpful service you can provide your clients is a periodic newsletter or access to a blog post about accounting issues they may be facing. This can also be a helpful way to attract new clients. This week create a story for a newsletter or blog post about one of these topics (or a topic similar):
Importance of budgeting for a small business
Cash management
Cash budgeting
Understanding your cash flow
Getting your customers to timely pay you
The post does not have to be long, just readable and contains some valuable information. Remember the target audience is a small business owner not fellow accountants. There are plenty of examples of similar post so feel free to look at some for guidance. Just do not copy them.