Heroic adventures are annoying to solo with the stupid nightfall modifiers, and they're only on Mercury for some dumbass reason. PvP isn't even an option, because of how bad it is. Doing hundreds of strikes is the only other way to get them. This isn't FUN.
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The grind isn't that bad. Especially doing it in strikes. Grab some buddies and make a night of it. I filled my engram cache with all 10 slots multiple times. Combine those, with all the vanguard tokens and gunsmith materials. You have engrams for days along with the amplifiers. Masterworks were dropping like rain. And use those Strike boosts. Typically I got 2 amplifiers a strike and the legendary engrams offset the 10 shards you paid for the boost.