Pre-DA, I simply had my own domain name and passed out business cards at anime conventions, or posted on webcomic lists online.
Granted, that worked until I had a SNAFU when changing my domain over to a new host, lost the domain to an opportunist who tried to sell it back to me for $2000, which I definitely did not have at the time, so I then had to purchase a similar domain name and try to direct all of my traffic to it.
The joke is on the cash-grabbing opportunist, I kept tabs on the domain until they finally let it go, then I bought it back and sat on it for a few years out of spite, despite never getting back to that webcomic because I had outgrown it during a long art rut.
It makes me sad because that old webcomic is still searchable via a few sites that did articles on it, or a few readers who kept bits of it. I felt really bad about never getting back to it, but after a decade of being on hiatus, it was pointless to get back to.