Here are a few ways to rewrite the title, depending on the desired level of formality:
Option 1 (Most formal and journalistic):
Australia to Pursue Stricter Measures Following Report on Ineffectiveness of Social Media Ban for Minors
Option 2 (Direct and professional):
Australian Government Reviews Regulatory Strategy After Study Indicates Minimal Impact of Social Media Restrictions
Option 3 (Concise and analytical):
Australia Considers Policy Shift as Evidence Suggests Limited Efficacy of Youth Social Media Bans
Recommendation: Option 1 is the most suitable for a formal report or news article, as it clearly identifies the government’s intent and the context of the study’s findings.