[SK8R43]

Play, ALOT. Don't expect to get better only playing for 30 minutes once a week.
Tweak your settings often to promote change and trick your brain.
Play songs out of your comfort zone, but try not to mash(spamming the keys pointlessly)
Go for aaa's as this will help your accuracy. I played with the "amazing" accuracy off for years but once i turned it on my accuracy got alot better, this could work for others as well.
Dont expect to get good in a week, unless you have other rhythm game experience.
Experiment with different key mapping to see what feels the best to you. I use xc m, because its at the bottom of the keyboard and feels better for my hands but i used to play something like as kl a long time ago.
Thats about it really. The more you play and familiarize yourself with the different patterns the better off you will be.