Signature campaigns are a great way to make money on the forums for sure granted you have a high enough level account to get paid slots.
Also there are tons of people looking for help on the forums and if you have marketable skills and proof that you can produce its easy to find work on the forums. I know personally I make a small amount daily by my forum posts as well as some also by farming the bitvest chat bot as well.
Just click on my signature below and then chat in the 2 chatrooms and the rainbot will give you 1K-20K satoshi every few minutes if you are lucky.
Tons of ways to make money online, just have to work hard to find those ways.