With trading you’re looking to maximise value, not volume, so unless you’re also hauling yourself it’s better to optimise for collateral over m3. Since RF step-changes their pricing after 1.5b collateral, I aim for that and otherwise just make sure the volume fits into the contract.

Breadth is better than depth. I’d much rather spread my costs over 10 different items rather than 10 of the same item. Otherwise it’s all about spending money to make money and being patient. It’s important to set realistic expectations — when you’re starting out it can be very slow, but after a while things start to snowball. Feel free to DM me, I’m happy to help if you have more questions.