1) The commandments that we have disobeyed.
God has given us his commandments and expects us to obey them because we fear (revere) God. We will be held accountable on Judgment Day for the commandments that we have disobeyed.
Ecclesiastes 12:13-14
13 Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man.
14 For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
Revelation 22:14
Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.
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2) Not using the spiritual gifts that God gave us to produce fruit for the edifying of the church of God.
God has given us spiritual gifts (read 1 Corinthians 12 for specific gifts) according to our abilities to edify the church of God. Planting seeds of truth by using our spiritual gifts pleases God. We will be held accountable by God if we do not use our spiritual gifts and produce fruit for him.
1 Corinthians 14:12
Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church.
Matthew 7:19
Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
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3) Not watching and praying for the second coming of Jesus Christ.
Watch current events in the world as they unfold and compare them with the Word of God. Do not be caught off guard when Jesus Christ returns.
1 Thessalonians 5:6
Therefore let us not sleep, as do others; but let us watch and be sober.
Revelation 3:3
Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.
2 Peter 3:9
The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
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4) Not seeking God and his truth.
If you show no interest in God then God will show no interest in you. Perhaps you are too busy for God for you are chasing your dreams and aspirations. Perhaps you are an atheist and do not believe in God. You do not believe that there is life after death. You need to decide who do you worship God or mammon? It is your decision with permanent results.
2 Thessalonians 2:8-12
8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:
9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
11 And for this cause God shall send them strong delusion, that they should believe a lie:
12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
1 John 5:20
And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.
John 17:3
And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.