With the current tactical ops event once you unlock everything there is no reason to continue playing the for the second week (apart from weekly ultimate reward that is usually rubbish).
A good way to motivate people to continue playing would be to reward XP boosts / challenge swaps per event challenge completed. Currently once you beat the S1 battlepass there is no way to obtain them without paying so having something like this would be appreciated.
It’s not a perfect solution by any means and certainly wouldn’t save these lacklustre events but it would be at least something nice for us more dedicated fans who want to play every week.