I was aiming to get on the top 10 of Google SERP for the keyword "pomodoro timer", and I finally got it. At this point, the average of its rank is around 8 and it is generating 20 ~ 30 visits everyday.
Interestingly, I did not do any typical marketing stuff such as link building or SNS marketing. The only thing I did was to post it on ProductHunt, which ended up 10+ referrals from bloggers. Referrals are good because it supports to push your rank on SERP, and it can also bring users to your site from the backlink.