Unfortunately, gas is out of Axion's control. The best way to reduce gas fees is to keep an eye on gwei at polygonscan.com/gastracker and wait for the amount/gas price to decrease. The lower the amount, the less congested the Polygon network is and the lower the gas price. You can see the gas price/gwei history at https://polygonscan.com/chart/gasprice
For staking, It's safe to use "low" gwei (as suggested by etherscan or metamask), however, the transaction may take longer to complete/go through. When buying into the accelerator, we do not recommend using "low" gas as your transaction will likely fail.
Notice: Do not change the "gas limit" in metamask. The gas limit controls the maximum amount you'll pay, and reducing it may result in a failed transaction and you paying anyway.