“Guest blogging is still useful for SEO; however, instead of guest blogging on low-quality or generic websites, you can try to get links from high-quality websites via guest blogging....” Guest blog on sites that make editorial or in-content links to your website's related page(s).
Yes, Guest blogging is still effective for SEO; however, instead of guest blogging on generic websites or low-quality sites, you should aim to get links from high-quality websites through guest blogging. Try to guest blog on websites that allow editorial or in-content links back to the relevant pages on your website.
Yes, guest blogging is still an effective strategy for doing off-page SEO. But you should keep in mind that your aim should be to get links only from high-quality websites through this strategy.