Nice and happy birthday. I also try to focus on increasing my SP but since I can't afford to buy some, I'm just left with trying to gain as much as I can by posting.
It's not a fast way to increase it but I do Steemit and I d love the process. And the beauty of Steem Power is that unless you power down, it constantly increases. :)
Don't stop with that. Use this what you have. Believe me even with that method you can achieve a lot over time. Keep on doing this.👍🏽