Do you pay fee for weebly? recently weebly inform that users have to pay fee for them so that they allow website to be indexed.
I had a weebly site a long time ago. All I did was have the keyword in the url and the title of your site and drove backlinks to it. This was a while ago so I don't think this works anymore. This was the free verson. Its best if you get your own website like wordpress.
With Weebly you can get away with more junk or spam backlinks than you can to your money site because they have huge authority and trust. You can do the safe methods: Web 2.0 Social Media Forum Posts Youtube Videos Also Guest Posts PBN Spammy cheap links from the marketplaces article marketing Almost anything goes with that type of property in reason. Just don't over do it so Weebly admin doesn't take a look at your pages.
Since co.co subdomains got delisted by google, its harder to rank a subdomain + in a shared IP. Will not invest any time in such free sites.