Places where you can run ads for your site, sell ad space, or otherwise market your site.
ComicAd Network
Buy or sell ad space for your comic.
Ko-fi
Ko-fi lets you set up a tip jar or if you go with a paid plan they will also do monthly donations similar to Patreon.
Patreon
This site can act as a paywall for your content which will help you monetize your comic. It’s also a place where you can communicate with your fan community.
Top Web Comics
A site where readers can vote for their favorite comics. Not a bad place to get a little exposure if you can crack the top 200.
Also see the Comic Lists page for places to list your comic.