The first thing they should do is secure their Bitcoin by transferring it to a secure wallet with strong security measures. They should also ensure they have a backup of their private keys or recovery seed phrase, which are critical for accessing their Bitcoin in case of loss or theft.
Depending on their financial goals and risk tolerance, they may consider holding onto their Bitcoin as a long-term investment or selling it on a cryptocurrency exchange for fiat currency or other cryptocurrencies. They should research market trends and seek professional advice before making any investment decisions.
It's important to note that Bitcoin and other cryptocurrencies are highly volatile and subject to significant price fluctuations, so investing in them carries significant risks. It's always a good practice to do thorough research and understand the potential risks and rewards before investing any money.