Info on Refeed day ?

Hello ! i recently am now 150ibs 5'3 female i typically go to the gym 5 days a week or 6. lifting weights til failure and 30 mins of stairmaster. i lost 30 pounds in the past couple months at a deficit. i'm entering a stage where my weight is not going down BUT i still see muscle improvement after raising my protein. ( deficit was around 1300-1500 cals) i started researching y the weight wasn't going down and a lot of people said after being in that's state for so long you need to go back to 2000 for a day or two and then deficit again? i was just wondering if this helped anyone, if this isn't the route to go, or another suggestion is great ! (NOTE: i am planning on going back to maintenance anyway to focus on building muscle)