"I don't want to" isn't a reason.
God is more and better than we are; so God can want more than anything we are capable of promising to Him. And He is able to have us succeed in doing all the good He desires to do with us. So, I personally tend not to make promises of anything I am capable of thinking of doing, because He is able to grow and mature me to do better than any promise I can make, now.
Even moments from now, God is able to have us doing better than what we now might be thinking of doing. So, I think it is not wise to boast what we will do in the future. But become able to simply submit to God, so He is the One guiding us, creating what we do . . . with Him, in sharing with Him and with one another.
This is another thing: God wants us to share with Him and one another as His family. So, He does not want me to live in isolation with myself and how I can make promises by myself and only about what I am capable of doing, but He wants us to do things with one another in His love, sharing in discovering what He has us doing as one in Jesus.
Have you read the Bible, and are you feeding on all the New Testament says, about how God wants us to share as family and do things in unity with one another? There are scriptures about how to relate with God and each other, how we are called to submit to God in His peace > including Colossians 3:15 > in sharing with one another > including Ephesians 4:1-3 and Ephesians 4:31-5:2. And all God commands in the New Testament is essentially a promise of what He will do with us; because God's word is guaranteed to do all which God means by His word > Isaiah 55:11 > God in us will do what He means by His commands; so this is why I say every commandment of God has His meaning, which He is sure to succeed in doing in and through every one of us who is His child.
So, if we isolate ourselves with our own ability and our own promise making, this is not wise, considering all which is possible with God.
So we need, then, to be concerned about all that God promises, including which He promises to do with us while . . . if . . . we obey Him.