Scaling Pre-Launch to Reality: My Shortened Timeline & List-Building Challenge

Hey everyone, Darius here. I'm a working Best Boy Electric, usually wrangling an M18 or LS 600d Pro, but lately I'm trying to get a documentary project off the ground. We're shooting on a C70 and an FX3, pretty lean. I keep reading about this 6-12 week pre-launch phase for building an audience and email list, and honestly, with our current schedule and limited crew, that feels like a dream. We're looking at more like 3-4 weeks before we want to start really pushing outreach. I've tried a few quick social pushes, but it feels like I'm just yelling into the void. How have you all (especially those of you with smaller teams or tighter timelines) adapted that recommended pre-launch duration to something more... realistic? What did you focus on when time and resources for list-building were short?