Avengers: Endgame might have brought an end to Phase 3 of the MCU, but the story is far from over. 

Source: We got this covered

According to Ladbible, Ant-Man 3 and Thor 4 have been included in Phase 4 of the Marvel Cinematic Universe.

Source: Digital Spy

The Independent claims to have received this leak from Roger Wardell, who they claim has been a reliable source over the years.

Although it is happy news, the Thor 4 revelation comes as a bit of a surprise as very recently Chris Hemsworth had expressed his desire to take a break from acting and spend time with his family. 

They are at a very important age. They are still young and they are aware when I leave more than before.
Source: Hola USA

BTW, Wardell didn't just talk about Thor and Ant-Man movies, he told The Independent that Marvel is currently developing Black Widow, The Eternals, Black Panther 2, Shang-Chi, Doctor Strange 2, Nova and Guardians of the Galaxy Vol 3.

Source: Monsters and crtiics

Mind you, none of this is confirmed news. We are expecting some details about all of this during the San Diego Comic-Con, where Marvel President Kevin Feige will be present. 

Source: Variety

Meanwhile, all I can say is 'shut up and take my money'.