Here are some legitimate ways to increase your Bitcoin holdings:

Trading and Investing

1. _Buy and Hold_: Buy Bitcoin and hold it for the long-term, hoping its value will increase.

2. _Trading_: Buy and sell Bitcoin on cryptocurrency exchanges, taking advantage of price fluctuations.

3. _Invest in Bitcoin-related assets_: Invest in assets related to Bitcoin, such as Bitcoin mining companies or cryptocurrency index funds.

Earning Bitcoin

1. _Mining_: Mine Bitcoin by solving complex mathematical equations, validating transactions, and adding them to the blockchain.

2. _Bitcoin Faucets_: Claim small amounts of Bitcoin from faucets, which dispense cryptocurrency as a reward for completing tasks.

3. _Microjobs_: Complete small tasks or jobs on platforms that pay in Bitcoin.

4. _Affiliate Marketing_: Promote Bitcoin-related products or services and earn a commission in Bitcoin.

Other Methods

1. _Bitcoin Lending_: Lend Bitcoin to others and earn interest on your loan.

2. _Bitcoin Staking_: Participate in Bitcoin staking, which allows you to earn rewards for holding and validating transactions.

3. _Bitcoin Airdrops_: Participate in Bitcoin airdrops, which distribute free Bitcoin to participants.

4. _Bitcoin Gaming_: Play games that reward players with Bitcoin.

Remember to always research and understand the risks involved with any method you choose to increase your Bitcoin holdings.