Unless the problem is internal, (The source is something on your network), there's not much you can do short of contacting your ISP and having them null route the IPs,
When you are being flooded with packets, even if you tell your router to drop all these garbage packets, they will still have to travelling along the wires to your router, before your router knows to drop them, the problem is your lines and saturated with this garbage data, you need to route these packets somewhere else that not your network, which is how DDOS protection services work, but your can only do this with help from your ISP
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Unless the problem is internal, (The source is something on your network), there's not much you can do short of contacting your ISP and having them null route the IPs, When you are being flooded with packets, even if you tell your router to drop all these garbage packets, they will still have to travelling along the wires to your router, before your router knows to drop them, the problem is your lines and saturated with this garbage data, you need to route these packets somewhere else that not your network, which is how DDOS protection services work, but your can only do this with help from your ISP