It seems like the OP is posing a question with the title of the thread:
"Any Advice for those Listening to Youtube Reviewers?"
The advice I'd offer would include the following:
1. Find credible sources prior to watching influencers. The Complete Guide to High-End Audio by Harley -- even an earlier edition -- is a good start.
2. Try to determine the reviewer's credentials somehow. Biography, other publications, etc. are a good way. One popular YouTube influencer has made a lot of money claiming to talk to dead people. That's a red flag.
3. Does the reviewer like everything? If so, they are not critical and are probably being remunerated for being non-critical.
4. How long has their channel existed and do they answer criticism? Audioholics and PS Audio respond to dialog.