As my experience RSS submission is not so effective for maintain alexa ranking but social media optimization and blog promotion is so helpful for manage alexa ranking.
Don't stress just on Alexa back-links. Get backlinks and it will slowly show-up on there. I have seen crap links showing up for plenty of websites... under Alexa links-in.
Is it really important to increase your Alexa ranking ? Unless you want to sell the site, i think it's not that important. The search engine results are more important in my opinion...
Alexa page rank is just important when selling the site for evaluation purpose. Google bots never considers it. Infact, it can be increased within a few days by use of traffic bots