According to the official walkthrough of episode 2, the main storyline is The Office, which includes several other secondary storylines that have a direct connection to the main line. Speaking of those that have developed, it's Photoshoots and Working in the office. (Greta, John, Admin, twin sisters, etc.)
If we talk about the main storyline of the game - at the moment it should be an investment in Monica's magazine. The last content associated with it was in Ep3 v4. (investor Mason). If I'm counting correctly, the only 2 investors left with whom there is no agreement yet on their investment in Fashion Magazine are Steve and Philip.
Since the release of Ep3 v4 and the development of the storyline with the investors a whole 565 days or 1 year 6 months and 17 days has passed. And this is where I see the main stagnation of the story - waiting more than a year and a half for it to develop is just too much. And no, letting Steve get involved with the investment in the magazine and waiting another year and a half for a storyline with Philip and his basement (or better yet, a full-fledged BDSM club where Monica could "work") is not a good option either.
More globally and specifically, the main plot of the game is Monica's fate after her fall. Decent Monkey in 2019 left an interesting post on a Russian-language resource where he described his vision for the game.
This is where I wrote about it. Assuming that the concept hasn't changed since Ep2 v6, there's no direct answer to your question, because everyone is equal.
However, as we can see, over time, the DM did prioritize and in episode 2 it was the Office storyline that became the main one. And the Office is above all a storyline with investors. It's pointless to talk about Farm 218 now, because it's already clear that it's directly connected to Marcus' path. But at the rate Marcus' storyline is being updated, we're more likely to "grow old and retire" before Monica gets to the Farm. So I leave the promises of voluntarily sending Monica to the Farm to the developer's conscience.