You can gather a few more tens of u, each time just brush 1024u, not too much or too little, prepare a dozen or so as compensation for wear, then buy zkj, and buy it back again, no need to wait, find a time period when the price is stable every day, actually most of the time it's quite stable, when you're on the bsc chain it will automatically double your points, how many times you brush depends on your own plan, anyway, when brushing orders, just brush a power of 2 quantity, more won't be rewarded, less won't meet the standard and won't count for points.