Ride it as it is…practice bending and stretching and as you ride it more, it will start to clear a wee bit…it won’t ever totally clear but just by riding it regular can keep things at bay.
Depends on how it rides now though – local section was great when it was overgrown – it was a proper challenge and you had to get very low. It then got properly cleared and it is rather boring now as all the twists and turns have gone (so boring that the looking yoofs have gone in an build a couple of jumps there to make it a bit more interesting.
Assuming you ignore that stuff and go with the other advice, clearing this stuff will take a while and you will need to consider where you are dumping the cut vegetation as you don’t want it on the trail as that just adds to more issues.