There are already 2 suggestions submitted for this:
https://boardgamearena.com/bug?id=21341
https://boardgamearena.com/bug?id=30188
You could try voting on them, but they don’t have many votes and they're 3 years old so I doubt they’ll get addressed.
When I look at the tournament search page, I see a filter by favorite games. As a work around, I suppose you could just mark games as “favorite” once you reach ELO 100 and then filter by that. Definitely less than ideal, but maybe it will get what you want.
In case you don't know, to add a game as a favorite from the individual game page there's a button with an empty heart in the upper left that says "Add to favorites". When it's a favorite game, it will be a red heart that says "Remove from favorites". If you use the Play Now game page, the heart is to the left of each game tile.
