My suggestion is to add additional ways for people to unlock Merits while playing blackout.
Make merit earning easier and more worthwhile, grant merits for the following things
Weapon camo unlocks - You get XP in MP for completing them, why not Merits in Blackout
Skin unlocks - you should get like 25-50 Merits when unlocking a character, it is quite the feat.
Not thirsting enemies - Maybe grant an additional 5 merits per kill if the enemy bleeds out or dies by a whole team wipe, that way there is an incentive to not just kill everyone you down immediately. Risk vs reward
Distance kills grant extra merits - For every 100 meters or something, an extra merit is granted for getting a longshot kill
Headshots grant an extra Merit - If the kill is a headshot, an extra merit is granted
