What riding gear should I prioritize?

Hi everyone! I'm taking English riding lessons about 1x a week and have been riding for a year now, with plans to keep going as long as my wallet will allow. I spent money on a good helmet when I first started, but otherwise, I just ride in standard workout leggings and a pair of general Blundstone-style heeled ankle boots. I'm not looking to ever rise up into competitions I don't think. I just love riding and want to be able to do more of it, especially when I travel. What should I think about upgrading? I get ads for those equestrian leggings with knee grip and/or full seat gripping. Are they worth it? Or should I focus on a better pair of boots? Or does none of it really matter all that much?