Get as many UTXOs of the size you’re choosing. You get up to 37.5 of a size. The fee for 1 and for 37.5 are the same. Make sure you calculate the fee of both the network and the mix fee when choosing what size UTXO(s) to send. Do a lot of planning ahead of going in to it. I’d recommend some smaller transactions to get a feel for it first. I made some expensive mistakes. BTC Sessions video on it is a must watch before attempting. Feel free to DM with any questions.