It's difficult if not impossible to increase your intake of omega-3 without increasing your intake of omega-6 even more. I am not sure that's worth it.
There was a big push for this hypothesis in the 2010s, but on closer inspection the only research that seemed to support it was where the “low n3:n6 ratio” cohort were there by virtue of low n3, not high n6.
Where studies compare groups of people where ratios were manipulated but both were at adequate levels, I don’t believe we see any evidence of a deleterious effect.
TBH this sounds way to complicated. How could we survive? My guess is, all the studies are incomplete and flawed in some ways.
" Linseed oil, but not fish oil, leads to a desirable reduction in arachidonic acid (Omega-6) concentration."
https://www.researchgate.net/publication/240952797_Studie_zu...