Freebitcoin (https://freebitco.in/?r=366862 consider using my ref link if this article helped you)
1. Step (Getting rid of restrictions)
There are a few restrictions at first but if you deposit or have 50$ worth of btc in your freebitco.in account you will get rid of all of them, first one will give you 2x on your minimum amount of btc claimed and the second one will get rid of the captcha, I absolutely recommend doing this, it's really not that big of an investment and it's extremely useful.
2. Step (Claim as much as possible)
This one is obvious, the more you claim, the more btc you get, the minimum amount of btc you get right now is (0.00000038 BTC) (0.002$ ~) but varies depending on the bitcoin price, however the amount in dollars always stays consistent.
3. Step (The Strategy)
You are getting the minimum amount of BTC per claim + Reward points + Lottery tickets, if you want lottery tickets, that's fine but it's really a small RNG to win it. You can go to 'profile' and disable lottery tickets, you will receive reward points instead of lottery tickets at a 1:1 ratio. So now you are getting 4 RP per claim as well. (1 RP = 1 Satoshi) so the minimum claim is (0.00000042 BTC) instead, however you can increase this further.
RP strategy: Go to the 'rewards' section and you will find an option called reward point bonus, the max reward is
(100 REWARD POINTS / ROLL)
All rewards are the same when it comes to make them worth it, you have to claim at least 12 times to be even, anything after that is profit, so if you have the 100RP per roll enabled, you will need to claim 12 times to get your 1200 RP spent back (+4 each roll) and each roll after that gives you 100 RP, assuming you claim 14 times per day, you are getting (14 x 4) + (200) = 256 extra RP per day and 0.00000532 BTC from rolls. thats 788 satoshis per day. To further increase this you can use BTC bonus rewards. Max is a 1000% BONUS applied on the min roll. However because you are gaining only 256 extra RP per day and the max reward costs 3200 RP, you can only use it once every 12 days ~ (Not including weekends with x2-3-4 RP bonuses offered by Freebitco.in) So you are earning an extra 1200 Satoshis every 12 days, 100 per day extra. Now you are at 888 Satoshis per day (Real calculation taking in count extra RP bonuses + Random lucky number rolls = ~ 1000 Satoshis per day (0.0527$ ~).
You are also earning a 0.0109% interest daily on your holdings, assuming you deposited the 50$ (0.01 ~BTC) you are also getting 109 extra satoshis every day so 1109 Satoshis per day (0.06$ ~) that is increasing everyday.
Other RISKY ways to increase your BTC:
Obviously gambling is one of them but I highly recommend against it, the biggest benefit from gambling is that you can increase the base reward to 2x, 3x, etc however you are risking your whole balance and you need to wager a lot, another benefit is that you get extra RP and lottery tickets but again, you are risking it. Now there are wagering contests that pay up to 10.000$ to the winner but you will need a big bankroll to ever win it. Freebitco.in also offers betting on a few sports events as well as tv shows and more.
They also have different contests once in a while.
Consider using my ref link: https://freebitco.in/?r=366862 if this article helped you