Given the potential and amount of block rewards (along with the ever-increasing value), it's part of Bitcoin's incentives mechanisms to have an investment be put down prior to gaining that reward.

It's another of Bitcoin's low-time-preference conditions. You find cheap energy, you invest in a certain amount of miners - What makes sense for your financial and also energy/price position versus how quickly you expect an RoI).

Personally, I've found the best way is to stop asking that question and jump in as soon as possible - If you're able to.

You can get good deals via hosting services that offer cheaper energy, for instance, kaboomracks sell you a miner and also host it for you, so you can have them host it for a monthly fee (price of energy). Once the contract runs out (usually annual but can be longer) and you choose to no longer renew it, they'll ship the miner to you as it's yours.