You will never get bumped to business, so forget about it.

If the stars lined up correct, it may happen say if there's empty room in business but coach oversold; still CO will upgrade all the elites before you. You have zero chance.

And if they ask for volunteers to give up their seats for voluntary bump, they'll give you hotel room for next day or put you on another airline. They will not give you BF seats.

3 roundtrips is about 22,000 miles a year. You're very close to qualifying for silver. Just do another US domestic flight to the west coast or something to cross the 25K mark.