Considering the entire crypto space and the knowledge and understanding level of majority of people in the crypto space, you will understand that Bitcoin is no where considered as under utilized by people. The reason why you may think Bitcoin is under utilized is due to the fact that Bitcoin is not really used in the mainstream financial transactions. But if you are trying to tell people to use Bitcoin in their daily transactions rather than holding unto them then in some way Bitcoin is being under utilized. A lot of people in the bitcoin space see bitcoin as an investment coin rather than a currency for exchange of goods and services.  In such case, bitcoin is highly under utilized..