Why did the Huns basically disappear from history after being such a powerful source in Europe and Asia?

Hunnic dominion over Barbarian Europe is traditionally held to have collapsed suddenly after the death of Attila the year after the invasion of Italy. The Huns themselves are usually thought to have disappeared after the death of his son Dengizich in 469. However, some scholars have argued that the Bulgars in particular show a high degree of continuity with the Huns. Hyun Jin Kim has argued that the three major Germanic tribes to emerge from the Hunnic empire, the Gepids, the Ostrogoths, and the Scirii, were all heavily Hunnicized, and may have had Hunnic rather than native rulers even after the end of Hunnic dominion in Europe.

Explanation:

The history of the Huns spans the time from before their first secure recorded appearance in Europe around 370 AD to after the disintegration of their empire around 469. The Huns likely entered Europe shortly before 370 from Central Asia: they first conquered the Goths and the Alans, pushing a number of tribes to seek refuge within the Roman Empire. In the following years, the Huns conquered most of the Germanic and Scythian barbarian tribes outside of the borders of the Roman Empire. They also launched invasions of both the Asian provinces of Rome and the Sasanian Empire in 375. Under Uldin, the first Hunnic ruler named in contemporary sources, the Huns launched a first unsuccessful large-scale raid into the Eastern Roman Empire in Europe in 408. From the 420s, the Huns were led by the brothers Octar and Ruga, who both cooperated with and threatened the Romans. Attila appears to have killed his brother and became sole ruler of the Huns in 445. He would go on to rule for the next eight years, launching a devastating raid on the Eastern Roman Empire in 447, followed by an invasion of Gaul in 451. Hope this helps. Mark as brainlest plz!