Mining profitability is based on the current Bitcoin price and mining difficulty.
Mining difficulty increases about 5% every 2 weeks or 2016 blocks, but may vary based on global hashrate.

To get the most out of your hashrate on the mining pool, we highly suggest that you activate "auto-profit switch" on your account. When activated your account will automatically switch to mine the most profitable coin (BCH/BTC)

You can see a mining difficulty compassion chart for BTC and BCH here:

We have a great site to see the Bitcoin (BTC) ecosystem at a glance here:

If you would like to see past BTC mining difficulty history, please have a look at the stats on the bottom of this link:

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