How did the Roman Empire collapse rapidly under the impact of the people's movement, and how did the Visigoths immigrate?

The rule of the Roman Empire was still severe, but with their own slackness and policy mistakes, the Roman Empire gradually declined. In this process, how did the Visigoths immigrate?

First of all, the abuse of civil rights directly led to the decline of the Roman Empire. Because of this, Rome's finances were tight, and what the army wanted was money, so the Roman Empire began to decline. After that, the peasant uprising lasted for more than two worlds, which led to the decline or even disappearance of Gaul slave owners and nobles, and also aggravated the decline of the Roman Empire, until a leader of the Germanic family abolished the little emperor of Rome, which led to the demise of the Western Roman Empire.

Visigoths lived in the Danube valley in the first century, and were oppressed by ostrogoths in the fourth century and migrated to the lower reaches of the Danube. Then apply to the Roman Empire for entry and residence, and enter the Empire after being approved. However, the Romans did not treat them as human beings, but as slaves, and the Visigoths rebelled under the leadership of Fritea Gunn. It doesn't matter. What matters is that other ethnic groups in Rome also revolted and were later suppressed. In the 5th century, they looted Rome and settled in Spain. In the eighth century, it was wiped out by Arabs.

The demise of the Roman Empire had little to do with the Visigoths, but was mainly attributed to the Germans. Of course, the visigoths are also a branch of the Germanic nation, but the visigoths' feudal system was established on the basis of the Roman Empire, drawing on some excellent achievements of Rome and forming their own feudal land ownership.

Do you think the Visigoths owe their achievements to the Romans?