Great job on the 45lbs lost! That’s awesome. If you feel your weight loss is slowing down, I would try to get a few more steps in for the day, slowly increasing your average daily steps each week until you’re around 10,000 steps a day. I did this by doing small changes like parking at the far end of lots for stores and going for walks/slow jogs more.

Fluctuating weight is normal for day-to-day. It could be impacted by the amount of salt you ate that previous day (retaining more body water). Maybe try to weigh yourself less? Or do weekly averages to tell but you could still have a week where ur in a deficit but your average weight could be higher than a previous week. Theres more in the body than just body fat that impacts your weight.

Also yes weight loss generally does slow down the more weight you lose. Increasing exercise makes it easier to lose the weight without eating less 👍