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In that case, you can create some rules in your robot.txt file. All depends on the configuration of your site. Also, you need to check on your search console and your crawl budget. As I mentioned all depends on your site. If you deal with 10 new users per day, just take it easy, config your robot.txt file in the other hand if you deal with 1000 or 10000 users, in that case, you will need to think in a better solution. The first idea that comes to my mind is to create a script on javascript who evaluate some parameters on those pages and if meet the parameters (do not add the tag) if not **(add the tag) **

Yes, like Tawny said, it can take some weeks even months to reindex specially if your site doesn't change a lot along time. Be patient