There's site wide trends. I assume you're not looking to create a trend just to push football off. If so, my experience won't help!
Buried in the site somewhere is their idea of what you're interested in.
On the web, having logged in i do...
More / Settings and privacy / Content preferences / Trends
Sets whether they just give you generic trends or for you. If you've got this off, maybe football is possibly just what the average twitter user is interested in?
But also
Settings and privacy / Account
Your twitter data / password agin / Interests and ads data. Then three sources to choose.
If football is in there you can untick.
My list is moderately wrong, but long enough that it doesn't come out with just one thing.
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