What does God desire from me?

The answer of the Bible

God desires that you find out what He is really like, learn to appreciate Him, build closeness to Him, and work for Him out of a heart full of love (Matthew 22:37, 38; James 4:8). Jesus explained and modeled for us how to do this in our daily lives (John 7:16, 17). He not only talked about what God wants, but he lived like it. He even said it was his purpose in life to always do what God wants and what is important to him (John 6:38).
Do I need a personal sign from God to know what He wants from me?

No, because the Bible already has everything God wants people to know. With it, you are "fully equipped," that is, you have everything you need (2 Timothy 3:16, 17). God wants you to study the Bible, ponder its contents, and thus find out what He wants you to do (Romans 12:1, 2; Ephesians 5:17).
Can I really succeed in doing what God desires of me?

Yes, definitely. Because the Bible says that God's commandments are not too hard for us (1 John 5:3). Which is not to say that it is always easy to keep them. But it is always worth the effort, because you will only gain. As Jesus said, "Truly happy are the people who hear God's word and live by it" (Luke 11:28, Hope for All, 1983).

Translated with www.DeepL.com/Translator (free version)