Many reasons could be the cause of people's lack of interest in Bitcoin let me add
1. Lack of basic infrastructure: Some areas lack electricity and internet connections. And without these basic facilities, it will be practically impossible to be part of the Bitcoin industry.
2. Fall of some major exchanges: People are scared of losing their money and when they hear news of big exchanges going bankrupt they become skeptical about investing in the sector.  Most of them are not aware that one can engage in Bitcoin transactions without these middlemen
3. Lack of security education: Some persons feel that becoming their banks is risky because they lack the basic knowledge of securing their wallets. So they prefer to stay away from the industry.
4. Long-term investment: Many people prefer short-term investment. So when you show them the true picture of Bitcoin, they are not comfortable because they want to make profit within a short period.