I'm going through a bit of a reset in one of my dynasty leagues, and while it's a bit different as I'm looking to jump back to contention next year, the theory is the same. You have some flexibility to buy-low on players and sell high. If you pick up a few young guys like Maccelli that someone is willing to pay up for at the right time, or if after Eklund's three-point-night someone wants to treat him like he's going to be an 85-point-player next year, you can consider that. On the flip side, I have picked up slumping players like Josh Anderson, Zach Whitecloud, and Dante Fabbro, and they have started to turn it around. Every bit of playing the market like that can help get your team to a better spot of overall value. With a limited keeper setup, keep selling players for moderate pick upgrades, and focus on getting one or two key keepers locked in, then you can take advantage of cheap deals on desperate GMs that have extra keepers to unload in the offseason. Benson is the only guy in that pile that I might consider actually keeping at the end of the year. You want to be keeping top-100 players, and none of the other guys are likely going to be that this year, or even in another year.
Looking at ages, you need to have a window that you're aiming for. As an example, if your core players now are all in their early 20s, so you want to aim to be contending in three years - or at least that would be the first year of your real window. In the meantime, you want to collect players and assets that can help you by approaching their peak value/production in three-year's time. That means top players from the 2022-2024 draft classes would be what you're aiming for. In reality, in a league this shallow, you should be able to turn things around on a slightly shorter timeline.