To remain Spiritually alive, you must:

OBSERVE THE LORD'S SUPPER
John 6:53-58 Then Jesus said to them, "Most assuredly, I say to you, unless you eat the flesh of the Son of Man and drink His blood, you have no life in you. Whoever eats My flesh and drinks My blood has eternal life, and I will raise him up at the last day.  For My flesh is food indeed, and My blood is drink indeed. He who eats My flesh and drinks My blood abides in Me and I in him. As the living Father sent Me, and I live because of the Father, so he who feeds on Me will live because of Me. This is the bread which came down from heaven - not as your fathers ate the manna, and are dead. He who eats this bread will live forever."

Acts 2:42 "And they continued steadfastly in the apostles' doctrine and fellowship, in breaking of bread, and prayers."

Acts 20:7 "Now on the first day of the week, when the disciples came together to break bread..."

I Corinthians 11:23-26 "For I received from the Lord that which I also delivered unto you: that the Lord Jesus on the same night in which He was betrayed took bread; and when He had given thanks, He broke it and said, "Take, eat; this is My body which is broken for you; do this in remembrance of Me." In the same manner He also took the cup after supper, saying, "This cup is the new covenant in My blood. This do, as often as you drink it, in remembrance of Me." For as often as you eat this bread and drink this cup, you proclaim the Lord's death till He comes."

BE FAITHFUL UNTO DEATH
Matthew 10:22 "And you will be hated by all for My names sake. But he who endures to the end shall be saved."

Matthew 24:13 Jesus said, "But he who endures to the end shall be saved."

Romans 2:7 "eternal life to those who by patient continuance in doing good seek for glory, honor, and immortality."

Hebrews 12:1, 2 "Therefore we also, since we are surrounded by so great a cloud of witnesses, let us lay aside every weight, and the sin which so easily ensnares us, and let us run with endurance the race that is set before us, looking unto Jesus the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God."

James 1:12 "Blessed is the man who endures temptation; for when he has been approved, he will receive the crown of life which the Lord has promised to those who love Him."

James 5:11 "Indeed we count them blessed who endure. You have heard of the perseverance of Job and seen the end intended by the Lord - that the Lord is very compassionate and merciful."

1 Peter 2:19 "For this is commendable, if because of conscience toward God one endures grief, suffering wrongfully."

Revelations 3:11 "Behold, I am coming quickly! Hold fast what you have, that no one may take your crown."