Here are a few options for a formal title, depending on your focus:
Option 1 (Most direct and academic):
“The Correlation Between the Decline of Local Journalism and the Prevalence of Misinformation: Evidence from Election Cycles”
Option 2 (Concise and journalistic):
“New Research Links Local News Voids to Increased Misinformation During Election Periods”
Option 3 (Formal and analytical):
“The Impact of Local News Deprivation on Misinformation Proliferation: An Empirical Study of Election-Year Trends”
Recommendation: Option 2 maintains the best balance between professional tone and clarity.