It's certainly correct - for those who play enough ranked strokeplay to improve average and eventually tier up.
For the following, take my words solely as a factual description, it's free of judgement.
For you, WGT has a different path.
You played just a few (three) ranked rounds in 6+ months. I assume that you concentrate on mobile games(?) They will promote you by level, though I don't know the details.
But, all is fine, as long as you have fun in the game!