Theres a single way to get better UR and its to play more. Good UR comes from experience and knowing what youre doing, good rhythm sense develops over time and your tapping gets more stable. You should rather focus on improving at the game as a whole instead of focusing on a single aspect. Its too early for that. Improving your reading and tapping will improve your UR. You cant improve UR without improving those. Git gud at the game and your UR will follow. About ODs, OD10 gives more accurate feedback, ofc yiur UR will be the same since youre still tapping the same way, you just get harsher feedback (and more pp). However OD10 is way too hard flr you currently, it will not provide you feedback since youre just gonna get 100s upon 100s. Dont bite more than you can chew.
My UR is usually 90-120 lowest is something like 72. For singletap maps its 90-105 and on stream maps 95-120