indexing problem, need advice

i build new site on a new domain (clean) about 2 months ago and i have total 12 pages of content. 4 posts in blog each no less than 1k words unique and quality content, 3 post each over 1.5k in another category, homepage 2.5k words, and rest is contact,privacy,ToS pages.. Site have some social shares real, and 10-20 good links including couple guest posts pointing to homepage (brand,naked urls) On page seo is ok, Webmaster tools report no any errors. However from the 4 posts in blog 3 indexed in a few days, but 1 is not indexed after month of time. So i tried to index it with WMT and after i request indexing it show next day on search site:domain and i thought ok.. but now i check again and its not indexed. I never had this situation before usualy all pages/posts index in couple of days naturaly even without any links, but now this problem not just on this site but on other 2 new domains. I post really great content but some pages or posts index in 2-3 days, rest of site not.. Domain B - homepage and 1 post indexed in just 3 days, and 1 post, contact page, privacy policy, ToS (not index already 10-15 days). Does anyone have similar problems with sites on new domains and is there anything i can do? thanks for advice.

did you try in search console? i think it may be help your page get indexed again

Yes i tried to request indexing for that post, and it show maybe for 24 hours then its gone again.. sitemap submitted 12 indexed 11

luc1fer said:

Yes i tried to request indexing for that post, and it show maybe for 24 hours then its gone again.. sitemap submitted 12 indexed 11

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Try manual submit the website on google

Google search console. If you have a PVA google account you can do that. If it supposed to be indexed it should index by submitting to it.