That's what I mean, now there are many new Blockchains that offer low transaction fees. In the new Blockchain there is also a lot of potential to make a profit, people see this and finally come in. Ethereum which was initially much debated because of the expensive Gas costs was finally abandoned little by little, and this had an effect on the decline in ETH Gas.
I think competitive a lot of new blockchain have offer most lower fees transaction giving advantage for any new project will choose network have lower fees.
Have been longer time for Ethereum get decreasing fees transaction and right now keep stable under 0.7 gwei make new history most cheapest fee by using Ethereum network.
But some time, Ethereum get high decreasing of fee transaction when have new project launching and releasing any airdrop for claiming coins with Ethereum network.