[Discussion] Reupload because last post got buried. Questions about getting better.

So, I have decently high stats that I'm happy with, 2600+ stars, 900+ user coins, 2000+ online levels, but a lot of my stars, coins, and levels are easier features, just star grinding and coin farming, and I'd like to be able to get far in harder features more consistently, as I find them more fun, and I'd like to be able to beat more demons more easily.

I've disabled auto checkpoints recently and decided to only go into practice mode for levels that are nearly out of my league, or if I put a lot of attempts into a level before practice. Is this a good way to improve?

Is just doing harder features over and over a good way to improve my skill, reaction time, sight reading, and muscle memory? Because lately I've put in maybe anywhere from 10 to several dozen on average in harder features (6-7 stars and up).

Thanks.