They need to pick a lane in the seven or less days. Their farm system is highly rated, so use those assets by either upgrading the current roster or trade away anyone blocking the kids and bring them up. No more half measures. There are a lot of great suggestions on different trades here, but what is the end goal.
If they truly want to contend and not just get into the playoffs, they need at least two relievers that you can rely on in the back end, a starting pitcher and one more bat in the lineup that lets you upgrade over Bell as your cleanup hitter.
If they can't make that commitment, trade Larnach, Bell and Jeffers and maybe Martin for whatever you can get. You need to clear room in the outfield. Bring up Jenkins, Culpepper when healthy. Decide what other two outfielders to bring up. Let the young guys grow together, have patience because there will be hitting struggles and missed plays in the field due to inexperience. Shoot for a window of 28 or 29 to truly compete. See what you have and fill in holes the next couple of offseasons.
But build a team that can truly contend. Winning a World Series is hard, but give me a team that at least feels like you have a chance to get there, not just make the third wildcard. That you don't need every break and get really lucky to make it. That is this year's team. Good teams make their own breaks and create their own luck.