What makes God worthy of praise?

If you as an individual don’t understand why God deserves praise, how can you praise Him?

And they sang a new song with these words: “You are worthy to take the scroll and break its seals and open it. For you were slaughtered, and your blood has ransomed people for God from every tribe and language and people and nation. And you have caused them to become a Kingdom of priests for our God. And they will reign on the earth.” (Revelation 5:9-10)