Is there a particular decent you enjoy that has a few sections that you sometimes avoid as it looks too hard? Or even a nice bit of singletrack you enjoy but cant seem to “flow” on or dont feel your riding it fast enough?
I found that ‘sessioning’ a section of track really helped me build my skills. If you know whats coming up and you have a good idea of what speed you can hit it you have more mind space to think about what you and the bike are doing and therefore what you can improve on.
Alternatively some people find that following someone helps massively and can give a new insight into line choice, speed and body positioning.