The Sensex has reached a new high, with a 14.4% increase from 70,000 to 80,000, and a potential 12.5% gain to reach 90,000. Despite the high levels, investors are advised to continue investing, as previous milestones have proven to be buying opportunities. A prudent strategy is to invest consistently, with a focus on flexi-cap strategies and a large-cap bias, and a horizon of over 5 years.