You are already seeing some results so that's great. Best of luck for your journey!
For ranking, there are some methods but the most popular one involves increasing youtube views and likes. You can use either view exchange sites like vagex or the services of someone who provides paid views but a word of caution: a few days ago there was an update on youtube due to which a lot of videos have been banned for inflating view count. So, if you are looking to increase the views by these methods, you need to be very careful.