According to a trusted source, Resident Evil 9 has been in development for quite a while. The focus is initially on Resident Evil Village, we shouldn’t expect further details or even the release in the foreseeable future.
All the buzz in the market

As a matter of fact, The Resident Evil Village will not release until May. In addition, Capcom might already be working on the next installment of the survival-horror franchise. That rumor comes from @AestheticGamer1, who also goes by “Dusk Golem.” The spoiler Capcom’s current progress on the game. However, it was careful to point out that he does not expect it to release before 2024. The Resident Evil franchise is easily one of Capcom’s most important, so it doesn’t seem implausible. In addition, with development winding down on the current project. It only makes sense that the publisher might be looking ahead to the future.
The original Tweet from @AestheticGamer1.
One of the most prominent voices regarding the rumored Silent Hill reboot
The bottom Line

At the moment, almost everything at Capcom revolves around the completion of Resident Evil Village. Which is in development for the consoles and the PC.
Since the focus is, of course, on the completion of Resident Evil Village, we shouldn’t expect specific details about the new game in the foreseeable future. According to Dusk Golem, the release of the title should not take place until 2024 or later. Besides, there is definitely the possibility that the development of Resident Evil 9 will be subjected to a reboot.

“But don’t expect it anytime soon. I literally cannot see it released before 2024. To the point, it’s actually not worth even talking about right now. Anything could happen to it in dev, from the whole thing being rebooted.” explained Dusk Golem.
Resident Evil Village will be released on May 7, 2021, for the PC, Xbox One, PlayStation 4, Xbox Series X/S, and PlayStation 5.