Ethereum gas fees just collapsed 90%. If you're not repositioning your DeFi strategy today, you're leaving real money on the table. Here's exactly what to do — four steps. Step one: pull up Etherscan's gas tracker right now. We're at 2 to 3 gwei. That's basically free. Step two: reopen the positions you abandoned during high-fee season. Uniswap V3 LP ranges, Aave leverage loops, Curve pools — all …