Suggest you try fully winding it initially, approx 50 twists of the crown should do it. Wear it daily after that and see how it goes.
The Seiko self- winding mechanism is a bit primitive but its usually v. effective, it does wind in both directions of the rotor too. There isn’t much to go wrong, usually they either work or they don’t.
I suspect you’re not active enough to get the watch fully wound during a typical day, but you’re probably active enough to top up the power reserve if you start off with the watch fully wound. This is not unusual thesedays.