It is essential to stay and be safe, and to make good choices, but, if someone is standing in a queue beside you for coffee or similar why not acknowledge that person’s existence? Make eye contact? Smile and say hello? And if you have any spare change think about buying their coffee, e.g. "As part of my daily act of kindness I would love to pay for your coffee".
For sure, reaching out to others can lead to feelings of insecurity or anxiety but with practice it becomes easier. And who knows, although there are "no strings" / expectations with DAKtivism, maybe your act of kindness will have lots of great or feel-great consequences, e.g. if they talk about it to others and so share even the concept of DAKtivism; or if they act and "pass on" their own act of kindness in turn. These are all vital steps to help us get that bit closer to a kinder society.
Good luck! And do tell us abour your DAKtivism!