Experiment with change. New experiences become familiar surprisingly quickly. Replacing old, familiar reactions with new, intentional responses seems extra challenging to overcome. These thought processes are comfortable and second-nature and even if we can acknowledge they don’t always reflect well on us, it’s hard to subvert what we know.
A simple example would be mumbling a response rather than speaking clearly. The remedy is awareness, at least at first. The why isn’t important. Determining you’ve acquired mumbling as a type of vernacular from your parents or possibly as a result of your uncertainty of others’ desire to listen doesn’t change that fact that you’re a habitual mumbler.
What matters is how to stop mumbling and communicate better. Take note of the instances when/where you’re mumbling. Don’t try fixing the habit, just notice when it happens. Be consistent with noticing. Just see yourself in the situation: there you are, mumbling and leaving your sentences unfinished. It’s not worth getting hung up on how often/severely you mumble, just watch.
Once you’ve gained a handle on the ability to “watch” yourself when you mumble, it’s a smooth transition into watching yourself speak clearly. You are now aware you don’t mumble anymore. After a while it won’t be something new. You’ll become a habitual non-mumbler without thinking twice.