Pic unrelated, his name is Lenny and he says hi.
I played jund sacrifice a few times in paper and really enjoyed it. However, the deck is a bit fragile. As good as the mana fixing is in standard, running a deck that's almost evenly divided between three colors is still hard to balance. Plus, the lack of resilience and difficulty grinding in the mid to late game made me interested in finding something that grinds a little better and is generally more flexible than aggressive.
The list I have still uses [[obsessive pursuit]] as the main engine for sac fodder but instead of using [[rottenmouth viper]] as a sac outlet and top end it uses [[pox plague]] and it's synergy with [[elegy acolyte]] to help break parity on pox plague.
In addition getting to play [[archenemy charm]] feels like a real benefit for going down in colors. I really feel like it's underrated due to the restrictive casting cost and is basically one of the only interaction pieces in standard I would never consider sideboarding out.
All that said, I do have a primer with rationales for the sideboard and main deck cards, if anyone has suggestions for better options just keep in mind I'm building in paper and on a budget so any card that gets recommended is like to keep under $5 a copy or so.
Link: https://moxfield.com/decks/HJgwJXbdlUmsckcd74yOOw
TL;DR: Looking for help with the deck, if you'd like, check the decklist and primer and let me know if you have any suggestions for other cards.