A simple idea to help facilitate communication across different teams and   encourage employees to get to know each other better: Coffee roulette. Every Friday (or whatever day works best) randomly match employees (all employees, including senior leaders) in your company to meet up for coffee. You can draw names or use a random number generator to match people from your corporate directory - whatever works. And if you work alone in your home office just make it a virtual coffee meeting over Skype or Zoom with a colleague or even a randomly-selected customer.