As Blue Beetle takes flight, Xolo Maridueña's Jaime Reyes learns a lot about himself. After bonding with the Scarab, he realizes he is indeed meant to be a superhero. Granted, he just wanted to be normal rather than the host for an alien force. In due time, Jaime and the Scarab become symbiotic, understanding each other's potential and that Jaime's human form is more than just a vessel.
Source：https://www.cbr.com/blue-beetle-post-credits-scene-explained/
