(Bloomberg) -- Michael Saylor isn’t backing down. The Strategy co-founder is preparing to sell $4.2 billion more in preferred stock to fuel his latest Bitcoin bet — while throwing a lifeline to investors worried he’s diluting them into oblivion.Most Read from BloombergThe World’s Data Center Capital Has Residents SurroundedAn Abandoned Art-Deco Landmark in Buffalo Awaits RevivalWe Should All Be Biking Along the BeachBudapest’s Most Historic Site Gets a Controversial RebuildSan Franc...