Building PBNs Vs Links VS web 2.0

I want to rank my website with some tougher keywords, low medium competition. I have been using web expire 2.0s or blasting them with a gsa gig from fiver recently I think they gave me a minor position change +2-3 positions in the last week but not as much as I would like. Should I hit the pages with more web 2.0s (I used 5). I don't want to build a PBN its pretty expensive and time consuming, maybe can I buy PBN links, is it okay for me to buy some decent quality PBN links from…

Building PBNs Vs Links VS web 2.0