For a new upload, three checks are usually enough: 48 hours after publishing, at one week, and at one month. Positions move fastest in the first days while watch time accumulates, and a check on the afternoon of publication mostly measures nothing.
Write down three things with every position: the date, the country and the language. Without them, a screenshot from last month is uncomparable, and "we were ranking fourth" turns into an argument nobody can settle.
Then take one of three branches, because they need completely different work.
If the video is absent from the top twenty, the problem is discovery. Rewrite the title so it contains the phrase people actually type, and put that phrase in the first line of the description. This is metadata work, and it can be done in ten minutes on a video you published a year ago.
If the video ranks but isn't clicked, the problem is the thumbnail. YouTube gave you the impressions and viewers chose someone else's image. Studio's click-through rate for that video is the number to watch, and the useful comparison is against your own other videos on the same traffic source, not against a benchmark from an article.
If the video is clicked but not watched, the problem is the first thirty seconds. Nothing in the ranking will fix that, and continuing to optimize metadata while retention leaks is the most common way to waste a month.