In solo queue, pings are your only way to communicate. Use them effectively:
• "On my way" — use this BEFORE you rotate, not when you're already there. Give your team 5 seconds to prepare.
• "Retreat" — use this when you see a gank coming, not after your teammate is already dead.
• "Attack the enemy" — ping the specific target you want your team to focus. Don't just ping randomly.
• Objective pings — ping Tyrant/Overlord 30 seconds before they spawn. Not 5 seconds before.
One ping is a suggestion. Two pings is a request. Three pings is annoying and will get you muted. Never ping more than twice for the same thing.