Have you ever redesigned something that was working and watched the numbers get worse?
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The UI was functional but ugly for two years. An agency was hired, three months and $25,000 went into a modern redesign with restructured navigation. Within 30 days monthly churn jumped from 3% to 6.5% and 40 paying customers were lost. The churned accounts all said the same thing: "I knew where every button was. Now I have to relearn the whole product." The redesign was better by every design metric. It was worse by the only one that mattered. How do you improve something people use daily without breaking the muscle memory they've built?
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One way to lean on muscle memory instead of fighting it: borrow the memory people already have from the platform. In my app every pushed screen keeps the native iOS slide with the left edge swipe back, and only screens with no sensible "previous" cross fade without it, so a thumb that knows iOS knows my app. The on/off switch is drawn to match the current iOS system switch exactly, because Flutter's stock one still paints the older shape and next to a real one reads as a different control. Your churned users were not asking for ugly, they were asking for the same places. I would redesign the surfaces and keep every position and gesture where it was.