I'm glad you asked because I would do exactly the opposite Sony did.
1) Aknowledging the existence of the PS5 with a surprise video published all around social media. Ideally around december 2019 playing with the 25th Playstation anniversary, recaping the history of the brand and ending with the PS5 logo and a text saying "Coming 2020". People go crazy.
2) Now it's time for interviews on gaming and tech outlets highlighting the SSD. For the next two months Mark Cerny, Jim Ryan and Hermen Hulst talk about the future of Playstation in separate interviews, podcasts and such.
3) In march you do the Mark Cerny GDC talk. Due to pandemic it's a recorded video but no fake conference bullshit. Straight video presentation with Mark Cerny talking to camera and lots of graphics and visual aid.
4) In april you reveal the DualSense, but planned, not because it's about to leak. Highlight de haptics and new functionalities.
5) Leave May PS5 free to concentrate on one of your last PS4 exclusives. TLOU2 is one month away.
6) In June you make the Future of gaming show when you reveal the PS5 form factor and some games. It was actually quite good. I wouldn't have changed too much except don't show the Digital Edition yet.
7) In July you make the final marketing push for Ghost of Tsushima.
8) In August you reveal the second sku, the PS5 Digital Edition, and hint it will be cheaper than the standard version. And while you're at it show the UI of the system.
9) In september you broadcast the final big event, showing gameplay of Miles Morales, Forbidden West and Demon's Souls and trailers for first party unannounced games and third party. News about PS+ and Ps Now if there are any. End the show revealing price and release date. Preorders open. Call it a day.
10) In October you publish a complete teardown of the PS5 while the hype ramps up for launch. Maybe explain in detail how can you get one, how the memory expansions and backwards compatibility are going to work.
11) November you unleash the PS5 into the world.