Probably not then. You'd need to be an experienced electrician and have a fine tipped soldering iron to have any chance of a repair. Even then there's no guarantee of sucess.
It's probably best to accept that it will never get usb 3.0 speeds again, but should continue to work as a usb 2.0 drive.
Another issue with today's electronic devices is that a high percentage use Surface Mount Technology, this actually does improve the reliability as the connections of components and the circuit boards are more secure and less likely to crack with use due to micro-vibration, a usual cause .
However, when they do fail, there is virtually zero chance of manually soldering a repair link in to the circuit board or re-soldering the connection itself, the close vicinity of the hot soldering iron tip to the printed circuits, can cause damage to the nearby tracks and components.
These systems are just not designed for repair
There are specialist soldering stations available and low melt, fine solder, for professional use that can be set to a lower heat level to prevent the damage so it may be possible to repair the units by a specialist, but costs wold likely be more than a replacement.
One option is to remove the Hard drive from the case and replace it into a new USB 3 Caddy / Case, these are available quite cheaply online, (c. <$20), and are quite simple to use as they mostly do not need any tools
Amazon US link
Did you try to disable AV to see if the speed changes?
Is the disk de fragmented?
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