How to promote multi-niche site?

Well, I have a multi niche site with 22 sub niches in it.
I used to promote every niche by itself and the main domain too. once one of the posts was ranked high but since google change the rankings got worse. I bought several packages of backlinks but it didn't help that much...

Anyway now I don't know what to do in order to rank it... should I push every niche by itself or the main domain? and can u recommend me any good service which can do it? I have some money...

Thanks in advance!

Use social media, or use a PPC advertiser.

I bought several packages of backlinks but it didn't help that much...

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This could actually be your problem.

If those links were bad, they have gave you a temporary boost and then Google may have slapped you down for them.

Check Webmaster Tools and make sure you don't have any warnings that are related to incoming links.

Argoss is right with what he said. If you bought a lot of links than there is a distinct possibility that you could have gotten penalized for it. Also check the date you lost rankings against the dates of previous updates, some updates that could have resulted due to those links are not always shown as messages in webmaster tools.

Apart from that it is very hard to suggest an seo method without having analysed your website. There are many factors involved, not only offpage but also onpage. How is your website structured exactly? Are you working with categories and subcategories in order to distinguish the niches from each other? Are those niches related to each other .e.g all in the general finance niche or are they not related to each other, as in building houses, what to feed your cat etc. ?

How does your backlink profile look so far? What kind of links have you got? What percentages of hard keyword anchors do you have for each niche? How many hard keyword anchors does your competition have? How good are your links? What is their pr, trust flow and citation flow?

Without those information and more we cannot give you any real answer to the question. Generally speaking high pagerank posts help the best, but then again buying them as a service is not the best because they will fall from the first page and thus have less juice after a while. <- That point could be part of the answer to your question as well; if you ranked before due to bought high pr posts, they would have fallen deep within the page and now bring very little juice, thus you would have fallen. If you give us some real information and or the link to your domain, I am sure you would get some more helpful answers.