Make a tube site monetize that with CPA and ads, occasionally post some video clip teasers for gifs from your site linking back to your site ( thank you that conservatively so it doesn't look like you're spamming and continue mostly posting things from other sources so your audience doesn't disengage) and also place a link to your site in the header of your Tumblr page, and whenever possible when you post make sure to make use of the original source URL Space by placing your own site URL there even though there no follow you'll still end up with backlinks and probably traffic from them even from those post being reblogged to your followers followers who happened upon the links