Unplayable lag getting out of hand

That's the third time i'm writing about this and still no answer. It's starting to bug me, so any help would be appreciated.

So, let me start by saying that i had no problems playing bgs, raiding, doing anything else till lets say 2 months ago. From then on the situation goes like this. I can do everything i want smoothly and regular 25ms from 23.00-8.00 or let's say 9.00. In the time from 9.00 to 19.00 everythings works on medium-high quality with time to time latency spikes that are from 30-150. From 19.00 to 23.00 i'm unable to do anything, because my ping goes up to 3k+.
On the other hand, i can watch 4k youtube videos, play any game i want or whatever i come up with at the time just fine on any other occasion. For example, ping in League is always at 25, CS:GO doesn't go beyond 40 either. Is there anything i can do?

Thanks,
Booty Spanker