We can design a feasible signature campaign with that budget. If you are interested in, please contact me in PM.
They did it in the past (2021) and I think they were not satisfied enough with the result they get from the signature campaign so they stopped in 7th week.
I would prefer to see them offer real contest in this forum, what they spent for the free prediction contest can be allocated for other contest where players need to play.
Talking about exposure, of course signature campaign will be one of the best choice but it requires a lot of money and it gives no guarantee of good effects.
As far as I know their marketing/promotional budget is not big compared to the other competitors, so I guess they will not relaunch signature campaign in the near future.