Just plug in a couple of S9's and use them as heaters, reduce the wattage by half, solo mine with one, and pool with the other.
To be honest, I don't know much about the mining side of things. If you run a few miners, would it be possible to include your own on-chain transactions at a lower than average fee among the other transactions?
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Its possible, but good luck mining your own block. Lightning , Liquid, and good coin control are probably the best ways to reduce fees. Use lightning vs onchain whenever possible, open channels and consolidate utxo's when fees are low, swap from lightning to liquid to onchain and vice versa.
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