If your transaction fails, a majority of the time it's related to the use of incorrect gas settings:
GAS SETTINGS for ETH cross-chain transfers:
Set gas limit to 375000 and for gas price (GWEI) ALWAYS CHECK https://etherscan.io/gastracker and then set the Gas Price (GWEI) to be at least 20-30 above ‘high’. Follow recommended gas settings otherwise your transactions will fail.
Reset your MetaMask wallet EACH TIME you switch between ETH and Avalanche network, unless you use the two browser workaround.
GAS SETTINGS for ARC-20 cross-chain transfers:
470 gas price, gwei 375000
GAS SETTINGS for Swaps, Add/Remove LP:
Default Metamask gas settings