Bios are often written in the third person, especially for conferences, events and books. Social media bios can be less formal and in the first person.
Use your full name in the first sentence and refer to an accomplishment to help people remember who you are. (Julie Wong is a leading researcher … / Best-selling author Terrie Sharp … / Ahmed Modine started his first business at age 14 …)
Keep it short and interesting so people get all the key information before they stop reading.
If the bio is for an event like a conference, only include the details that are relevant to this particular audience. For a general bio, for example on your website, you can provide links for readers to find out more.
One or two personal details (e.g. Julie lives with her family in a smart home she designed herself ... / She learned how to open car doors with a knife. / ... he lost his house and car once) help create interest and a connection with the reader.