How better can new posts on new domain perform in serp

Yeah, I'm new here and to IM but I've been reading a lot, day and night on this forum and other blogs. With different opinions, one would definitely get confused about the performance of new domain and young posts.

>>> I have a four months blog (food health niche, optimized for comp and low comp long keywords) with over 100 articles (avg 3, 500k word articles) and 1,500 backlinks built more than a month now but traffic is about 20 UV daily.
>>> The second blog is app review with over 100…

How better can new posts on new domain perform in serp