Topre domes don’t usually “soften” in a big way over time, but they do have a short break-in period where they feel slightly smoother and lighter. After that, the force curve stays pretty stable. What you’re noticing may come more from your hands getting tired during heavier workloads rather than the keyboard changing. RealForce boards are consistent, so buying a new one probably won’t feel dramatically different after a few weeks of use. If the keys suddenly feel heavier or more distracting, taking breaks, adjusting typing posture, or resting your hands might help more than replacing the board.