Think about doing perfect X-wind landings within your current personal limits. Once you have that level of control you should be able to expand the envelope until it works you hard enough to stop the expansion. At that point you'll have a new set of challenges to master. And learn to cheat, don't land on the runway centerline when the runway is wide enough to land at an angle. Slow airplanes like the Champ can often be landed at an intersection and will experience much less X-wind angle (or even zero X-wind). That doesn't work so well in higher performance airplanes but those often have higher X-wind capabilities to start with.