Why is my internet bad lately?

Why? Before that I was doing pretty well, I was able to play Fortnite smoothly and without lag or watch Netflix

The Internet providers are currently Partially overloaded by the many people sitting at home. Maybe that's because.

Many in the home office about the node?

Because of Corona, many are at home and use the Internet out of boredom.
I have a fast connection, so it is not too bad, but I only get 1/4 of the bandwidth during the day. At night it is perfect again.
We have to live with the next few weeks.

Because now a lot of people are at home because of the virus and of course more on the Internet.

Because of corona