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According to me, First you select your niche site from that you will get maximum traffic and then check all the site's PR and Domain Authority. Then you submit your site in all this site. From this you can get maximum benefit.
If your ranking were gone up and down constantly then It is the effect of Google panda dancing update that penalized you continue in the month till its next update. So, May be you penalized from that and for that check your analytic and webmaster tool regularly.