Like @absentdenik said, tiktok would be a great way to grow a community as most of tiktok users are young fashionable children. Another alternative could be sponsoring, here are settings i would recommend for a game like yours:
I haven’t sponsored any of my games in a while (the amount of impressions/robux has gone up since then) but you’ll probably find that anything under 3-5k robux won’t attract more than one player at once. In my opinion, it’s best to save up a lot of robux and run a few ads at a time, and after that only run the ad with the highest CTR.
For only 2000 impressions, 6 clicks doesn’t seem that bad. You’d just generally need to put more robux into them. Also, remember mobile players cannot see ads but they can see game sponsors.