Increasing SP is difficult.. you can first try to increase your reputation..
Find people with high Steem Power .. (you can use the trending page).. follow these people and try commenting out on their posts.. many Whales are generous and do upvote your comment and you earn some SP, SBD and reputation..

So, that's my initial suggestion.. bringing whales to your post is difficult but you make your comment visible on their post and earn..

And if you can invest .. then use Bots . (probably @moneyguruu would be making a video on this soon)

And yup thanks for your comments!