It is important to exercise your thankfulness muscles daily. Not only is thankfulness commanded and appropriate (Psalm 136; 1 Thessalonians 5:18), taking some time every day to thank God and others makes you healthier all around. It gets your mind into a habit of looking for good things. It stretches your capacity for positivity. God likes to hear it. Other people like to hear it. It’s good for the soul.
I know sometimes we don’t always feel thankful, and sometimes we can’t seem to find anything for which to be thankful. But there’s always something for which to be thankful, so it’s important to keep an attitude that looks for things for which you can give thanks.