Well I was more referring to his fielding in game, as that is what hugely affects a SS overall rating and I don't think they regularly give players fielding upgrades, they pretty much stick to just hitting upgrades? (I think Seager got a fielding upgrade to force him into gold after his 3 HR game, but it's unusual)
The only attributes they usually change are contact v L/R, power v L/R, plate vision and discipline. The only ones of those attributes likely to improve for Semien is his power, which hugely impacts his ability to go up much. His batting average, walks and strikeouts look to be about as his career average, so his contact, vision and discipline are unlikely to go up.
If they did boost his fielding then it would give him a chance of a good upgrade, but they don't change that very often from what I've seen.