You need to tell your team what to do when you're split pushing. Even in gold/plat people have no idea how to work with splitpushers. Basically tell them they want to group up, but not engage unless the enemy team runs towards you. Basically how it works is you as the splitpusher are bait for the enemy team. To kill you it'll likely take 2+ champions. If you see your team fucking around in the jungle or in the base you want to back up (especially when you don't have vision on the enemy team). If all 5 of them engage on your team take their inhib, and your team will likely run away and in most cases lose 1 player. 1 Death for an inhib is always worth. If 2+ engage on you ping an objective for your team to take which should be easy for them since they're applying pressure on the map.
If they aren't applying pressure you'll get chased by 2+ players and likely die for nothing.
The counter to split pushing is the enemy team simply realizing they can take objectives by team fighting, and out pushing your team.