Create scoring rules based on lead behaviour like website visits or email opens. Give individual points per event to give your overall score the right weight. Use this to identify most promising leads.
Use the calculated lead score as part of your segment rules. Combine the scores with other data and conditions. This will help you to identify the most profitable leads that have not already converted in your sales flow.
Customize the overview page for Lead Scoring to show the score number for each lead. If you open a lead overview you not only get historic interactions in one screen, you also see the potential for the specific lead.