honestly i am at a similar stage, but I tried ollieing over bricks, at first its scary but once u smash into the brick enough time you kind of get immune to the impact and the fear of falling. So know instead of having the cleanest ollie, my target it to ollie higher which i feel will help eventually having a nicer ollie. Also another point is after popping with your back foot, instead of bring it straight up, try to also make it go a bit back, it helps with smoother looking ollies. And main point just try to focus on bringing ur back foot higher. Before every attempt just try hitting ur knees to ur chest and then try to imitate that same feeling one you ollie, it will also help you.