How to brush to earn, I am at the 60,000 level, and each time it costs 3-6u

$BSU Today I brushed the 60,000 tier, wear 1u, bsu no one is brushing anymore, liquidity is very bad, cannot brush at all. Today, Timi, I used 500u limit price to swap USDT and USDC, and every time I developed, I earned 0.1u, thought I discovered a new path, but in the end, I found out that the sky has fallen, the wear is even greater than normal brushing, boohoo.