I write a lot of Amazon reviews. I've been a top ranked reviewer for years (at one time in the Top 100 out of 80M+ reviewers).
It feels kind of narcissistic, but I begin a lot of my reviews with a little info about myself in a way that pertains to the thing that I'm reviewing. I do this to add some context to my opinion and I also do it to give the reader a chance to decide whether they should identify with me or not. When I review an item "as a father of three adult kids", then readers can either tell themselves "I'm a middle-aged dad too" and assume that I'll have a viewpoint similar to theirs or "I don't have kids and never liked kids" so they can filter my opinion through their own point of view. The point isn't for them to agree with me, but figure out how to apply the opinion of a complete stranger and decide whether they should go along with me or do the complete opposite. Either viewpoint is OK.
Being a dad is just one example. If I'm reviewing an RV product, I'll mention my years of experience with RVs so they can decide whether their POV as an experienced RVer or complete beginner makes more sense. Same with homeowner vs. renter, suburbanite, etc.
I figure that this context gives the reader the info that they need to figure out how to interpret my opinion.
