For example: Whenever you walk into a store, ask if they accept BTC or cryptocurrency etc. ? Even if you know they don't. It primes the cashier or manager to better acknowledge the next customer who asks a question like this and also starts a conversation or beginning to something new.
What would be your idea?
The simplest way for ordinary people to help Bitcoin growth is to buy its coins and hold them. More believers Bitcoin has, it is more powerful. This is the common rule for any currency at all.
I heard that founder of facebook want to introduce some things in blockchain to facebook! This will spread about Bitcoin much!