Since you are meeting your clients face-to-face and building a relationship of trust, it is in both your clients, and your best interest to offer more products, especially when they are in the same vein of your current product portfolio.
I like the idea of disability, long-term care, and investments, but group benefits is an area I think is more for a focused expert. The group benefits market is not was it used to be since the Affordable Health Care Act.
I love the idea of building up more revenue streams and working towards becoming a well-rounded financial consultant for your clients. Good luck in your business!