Your range expands through controlled encounters with difficulty.

Range grows through meeting difficulty in doses you can handle. Too little and nothing changes, too much and you get hurt and retreat, which sets you back further than not trying. The controlled version, difficulty chosen deliberately at a level just past comfortable, is what expands what you can cope with.

Rather than waiting for hard things to arrive at random, choose one on purpose at a size you can survive. A conversation you have avoided, a task slightly above you. Doing this by design lets you set the dose instead of having it set for you.