Hey there! You're gonna primarily wanna look into using Google Ads - its the thing that runs the majority of advertising on the internet, including tapas.
Here's a link!
I'm not entirely sure what the process is to implement them - most likely you will need to be able to access the HTML/CSS of your site in order to do so.
ComicAd Network looks really promising, especially if it can reach the same levels as ProjectWonderful did back in the day.
The other route is finding sponsorship deals (similar to how youtubers and podcasters do it), though I've never heard of a cartoonist having a sponsorship on their comic, with the exception of Erika Moen's Oh Joy Sex Toy, which makes sense cause she reviews stuff in her comics, but that's not so much a sponsorship as it is affiliate marketing.
I did some quick googling and found this which might be able to help you: https://chamboost.com/creators.html