Mining is a good way to earn more bitcoins all you need is a power generators and machines to mine which require electricity, if I get a chance to go for mining then I would definitely sell when the price rises and when I am in need, and will invest and start trading to increase the existing bitcoins and its profitability. The value of bitcoins increases over time and so will find alternative ways to increase my bitcoins either by bitcoin lending to trusted people which helps you to get good interest