I have worked with SEO during the last year and a half on my own responsible travel blog and seen an organic traffic increase of 900% the first 6 months. After the corona crisis, the organic traffic is already grown past what it was before, though different topics. I expect it to triple once travel topics pick up again.
I have just started out my freelance work and helping clients get their voice out too. For me, it's important to work with clients who's message is to improve the world we live in today as it' something I'm really passionate about!