I have 10 years old domain on which i have been working and building links for 1 year. i am trying to rank homepage for two 70k search terms. target page is always at positions 11-12 sometimes lower, but never higher. When i add new powerful links i see some dance and return to previous positions afterwards. whatever i do it won't let me step into first page. I have tried optimising page speed, anchors, keywords in content. no success. If its not some kind of weird penalty then i believe it must be on-site related. Anyone experienced something similar ?