If there is going to be a formula for living life to the fullest, it should come from God. God designed life and He is the one who gives life! So I think it would be good for us to take a look at what He says about how to live life to its fullest.
1 Peter 3:10-12 For “He who would love life and see good days, let him keep his tongue from evil, and his lips from speaking deceit. 11 Let him turn away from evil and do good; let him seek peace and pursue it. 12 For the eyes of the Lord are on the righteous, and His ears are open to their prayers; but the face of the Lord is against those who do evil.”