This is already possible, on any day of the week you desire, without affecting anybody else’s preferences. I assume you’ve subscribed to certain communities that you enjoy. If so, you simply switch your view to the Subscribed feeds. You can switch back anytime you want to All. As a bonus, you could even limit yourself to viewing only the communities on your instance by using Local.
I know that comes off a little snarky, but I don’t know what you do or don’t know, so I’m going with the assumption you don’t know. Otherwise, as others have suggested, you can block communities and instances, and also add keywords to filter out specific topics.
Edit: looks like it’s a feature request for the webui. I know Mlem has a keyword filter.
The issue is not politics posting. It's politics posting in non-political subs. Like people posting about trump on this community and calling it a shower thought