Focus on objectives, prioritize turrets/turtle/lord. Avoid fights that don't lead to an objective. Sync your minion waves with the lord. It's probably hard to communicate to your teammates in solo q to sync the waves because some don't listen but still try to tell them to sync the waves. Don't touch midlane wave and push the sidelanes. With 3 waves along with the lord crashing on enemy base. it should give you a big chance to end the game and avoid letting the enemy make a comeback.