Yes, you can do lottery mining but buying bitcoin would be reliable, even though it will take too much time to make the profits you desire.
In few occasions it may not take so much time as some may be thinking in making the profits from buying and holding bitcoin as you could be fortunate to buy at a time very close to when a bull run may take place hitting an ATH that beats the previous one. I am certainly no fan of lotto mining, I don't know maybe cause it doesn't seem probable to me at all.