Sig campaigns are good, but since primedice is done adding lower ranks you would take almost half a year to reach a point where you could join primedice again. If you can program you can make a lot as well.
As a full member, you can join Cryptcominer, which should give you something like $1.5 a day. It's not much, but it should help a little ($45 a month). You can also try selling stuff you don't need in the Market section. Even game accounts you don't use anymore might sell.