I use my account LoyceBot in a different browser for convenience for counting campaign posts. If you have different campaigns with different requirements, you could just make a few more accounts so you don't have to adjust the list of ignored boards per campaign every week. A private browsing window and
Captcha bypass code can help.
Alternatively, with Firefox (I'm not sure about other browsers as I don't use them) you can create multiple profiles. Each profile can have its own set of cookies, bookmarks, etc. Therefore if you stay logged in forever, you can simply log in to each account you need to use in a separate Firefox profile once, and then just open the profile you need each time. Additionally, you can install Firefox twice (or even just copy and paste the entire Firefox folder) to be able to run two instances of Firefox in different profiles at the same time.
See the link here for instructions:
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Multiple_profiles