Arguably, the Maquis was a storyline that went across Next Generation, Deep Space Nine, and Voyager. Maybe not a multi-part crossover, but it was a subplot that went across three shows with multiple parts.One thing that has never been done in Star Trek is a multi-part crossover that begins on one series and ends on another. They had plenty of opportunities during the run of Deep Space Nine, but nothing ever panned out.
Kurtzman has overall done an abysmal job heading up Star Trek, Picard was awful, but Discovery did show signs of improvement in Season 2. I will definitely give Strange New Worlds a look and hopefully it's a show that actually feels like Star Trek again. Anson Mount as Pike could potentially save this franchise. Plus Rebecca Romijn as No. 1 and Ethan Peck as Spock.