I Can Reach Max Level but I Can't Level Up

Li Chengtian became a god after traveling through time. After enjoying the loneliness for billions of years, he created a system for himself, reincarnated into an adult and experienced life. The system settings are as follows: 1. Unlimited experience Second, experience can be upgraded and exchanged for anything. Third, the upgrade cannot exceed that of the strongest person within a thousand miles. 4. Items that exceed the highest quality of similar items within a thousand miles radius cannot be exchanged. 5. When faced with a level of suppression exceeding level 50 and approaching death, activate the emergency mode. With a strength exceeding level 50 of the opponent, you can instantly kill the opponent, release the emergency, and return to normal. 6. Have an ordinary appearance 7. Have a character of justice, honesty, bravery, passion and perseverance 8. Wide range of hobbies 9. Three positive views 10. Ordinary birth