To become a better rider you need to practice, practice, practice.

To be realistic you need to build your own motocross track.

And if you know how to build motocross jumps and you have the space you can do it right outside your door!

If you don't have the space I know some guys who pooled their money and bought some land together just to build a practice track

To source dirt you can start digging a hole near your jump location, contact a local developer if he has any excess fill or get in touch with a pool company (they often have to remove dirt from site). You could put up a sign that says "Fill Wanted" with your number.

Are there hills or is it all flat? Is it a sandy base or hardpack? Do you have a water feature.

Draw up your own motocross track plans based on what you have already then mark it out on site. Using a bobcat or mini excavator to move the dirt (if you don't own one you could hire or borrow one) start to form the track.

Build your own motocross track and just practice!