This is a question that people have cried out in their darkest hour, and asked in their most confused moments. Some people even ask themselves this question when they are wanting to serve Him but don't know where to serve. I cannot tell them the answer to that but I can tell you and them how much He wants.
God does not settle for the 50% relationship. Nor will he settle for the 75, 85, or 95% percent. Make mistake that He will not settle for 99.999999 percent. It is 100% all the way. Nothing else will do. This means your prayer life is healthy (the Bible says to pray everyday without stopping), it means obey commandments. When you fail to obey you try again and again until you are free from the sins that bind you up. It means to tell other about God every chance you get. 100% means to make your life Holy.
Allowing God to take control of your life is the first step toward everything in your walk with God. Once you commit you give your all to living for God. Everyday in everyway you have to live for Him. Eat, breathe, talk, walk, sleep. Hide psalms and hymns in your heart so that you will not forget God. Never give up. Why? Because 99.99999 percent means you have been disobedient. Fall but rise up and over come.