is there any other alternative which is cheaper, as i dont want to use any CEX
layer 2 is a better choice to overcome the annoying transaction fee problem of the Ethereum network. but some time ago Ethereum transaction fees decreased quite a lot. If you don't like Uniswap, have you tried 1Inch?
I personally rarely use DEX. but many of my colleagues also recommend using 1 inch if you don't really like Uniswap. I know some people don't like CEX for whatever reason, but some people may be comfortable using CEX.