You are mistaken. You are forgetting the fact that from 1803 to 1806, Napoleon did not start the wars. It's the coalition members who took initiative to declare war against France.
The problem is that Napoleon won so crushing victories that he then completely upset what was still by 1803 a rather acceptable balance of powers with France dominant only in western continental Europe. In 1807, France dominated almost all continental Europe and its armies were in Poland.
This is only by 1806/1807 that he failed or refused to restore an acceptable balance of powers. He did it for a mix of reasons. Personal ambition and hubris, most certainly. But also because he had a problem : the feeling that he had no trustable partner for a lasting peace.
He had given what he considered favourable terms to Austria (Venetia had been given to Austria), to Prussia (Hanover had been given to Prussia), to Russia (from 1800 on napoleonic France had been striving to conclude a strategic wings alliance with Russia but Russia refused peace after Austria had been defeated in 1805 and Prussia had been crushed in 1806).