I think you have done great job in building your enterprise. The mowing and landscaping maintenance you are doing great at. I do think it may be worth while you taking some classes pertaining to the precast concrete and hardscaping world. You will learn what stone material to put behind a wall, what type of drainage, what type of geo-grid, what base should be under paving stones. It is very important to do something correctly and deliver these messages to your customers so they aren't just content with a wall having to be rebuilt every 5 years.