Actually there is a lot of ways to increase bitcoin. You can participate into different projects related to cryptocurrencies. When found a good project you will probably have a good reward. They often pay you crypto which can convert to bitcoin. Another way is bitcoin faucet which give you free bitcoin, you can find it in this forum also. Lastly, you can try investments but you must be knowledgeable first and have  a deep research for you to avoid failures or scams.