Every day dedicate your remaining time to becoming more like Jesus. Over the years we should be sweeter. More and more in control of our temper. Through the power of the indwelling Spirit a person who has been a Christian for a number of years ought to be less and less touchy, Less Vindictive. Less lashing out at someone.
Time is so short.
Get down on your knees and pray in earnest with God for a new heart. You need it. God longs to give you a new heart. If over the years you are still a grump, then you are probably lost. Notice what happens when we do not grow.