Use tags/categories. Depending on what does your CMS support.
If yours doesn't, then you're facing the prospect of migrating to a new CMS and importing posts. But then I'd ask the question: what's your ultimate goal? If you're trying to maximize views to monetize content, then it matters. (Or if you're using it for professional visibility/hoping to attract recruiters or something.) But if it's just a personal site to put your views online - then maybe you don't need to worry about SEO.
But i would like to organize posts better - will consider the tags and categories as that’s the most pragmatic but still not fully in on it