For improving jumping, try out a few T5/6s, and get as far as you can.
For improving beef in particular, I would work on improving each course at a time, so you don't have to remember all of the strats at once. Just work through the C1 strats until you know them then progress that way onto C2 and C3. The main issue you have currently is doing each jump as intended and not chaining endings of certain jumps to skip time wasting portions of the next jumps. It's important to know where you want to be after each jump, rather than just completing each jump without considering what comes after.