If the difficulty rises more than 7% a year, you will not make ROI on the bitcoin. It is better to buy and hold bitcoin.
That is correct but an increase in difficulty level also corresponds to an increase ( pump) in bitcoin prices
Bitcoin difficulty does NOT drive Bitcoin price at all.
There is a long-term mild correlation of price driving difficulty, but NO correlation the other way around.
The REAL correlation long-term is "profitability limits difficulty rise".