Most rectifying refers to something that is correcting or improving a situation or problem to the greatest extent possible. Synonyms for this phrase could include "highly corrective," "strongly remedial," "mostly beneficial," or "most restorative." These terms all convey a sense of positive change and improvement, suggesting that the thing being referred to is highly effective in its ability to rectify or address an issue. For example, one might say that a new policy at work is "highly corrective" in terms of addressing workplace safety concerns, or that a particular exercise routine is "strongly remedial" for a person with chronic pain.