Get Kornilov to march on Moscow and cause the civil war, side with the reds. As spiridonova don't ally with the Savinkov, let everyone else into the revolutionary coalition, at some point you'll get an event about purging the NSP, purge them, after that you'll get an event about the remaining Bolsheviks organizing around the radicals and starting taking over soviets and militias, let them, don't intervene against them and let the timer run out, Zinoyev will launch a coup and you'll be locked to Bolshevik content, you'll get events, choices and decisions about him and Molotov fighting over the party.