For our store, early on in the month will always be tighter on hours. Once the month goes on they'll add more in if they have more to play with. They're always trying to give extra hours beyond what was scheduled in the last week or even the last 2 weeks. They might be extra cautious right now because if BTS shopping actually happens (I imagine depending on what your area's schools are doing in terms of COVID) they need to be prepared with extra hours for the foot traffic.
Like others said, if you want your hours to maintain throughout the month look into getting cross-trained & make sure the ETL for that area knows ahead of time (our store's schedule is usually done by Wednesday and finalized/posted by Friday - sometimes Thursday evening). I'm generally in Beauty but also pick up shifts in Consumables, Fulfillment, Guest Advocate... literally wherever they want to schedule me. Some days I'm in Domestics, I've helped in the backroom. It really just depends on what they need. Basically I'm happy with anything that isn't cleaning lol. With so many on LOA, in my store, it seems like they're hurting the most for Guest Advocates.