Why do you want to know another platform to compete with Ethereum? Actually, you don't need to ask this, just monitor the development of several platforms that potentially become the competitors of Ethereum. For example, you can take a look at Binance smart chain, Tron chain, or Polygon chain. These chains can be the strong competitors of Ethereum in the future. Just monitor them, then you can conclude how far they can be great competitors of Ethereum now.
Polygon is not a competitor to ETH but they are just aiding the ETH network to scale. There are plenty of competitors for them especially BSC and even if ETH regains their old power, i am not sure how many projects will be using the ETH network as there are plenty of options available right now, but the developers have plenty of options to choose from right now.
Developers have alernatives now, BSC is the first one while ADA and SOL are also hyping and moving forward to compete,
It depends now with the developers if they still want to continue using ERC even the fees is really huge or
switch over with other available chain to their projects.
Investors are mostly aiming for lesser fees and that's how we see it now with all those BSC users.