If the motorcycle is oil shock absorber, you can put some oil out, it is not so hard. Nitrogen damping is deflated, and some damping can be adjusted. If the front damping spring is too long, a small cut can make the damping less rigid.
Extended information:
How to adjust the shock absorber of motorcycle:

Depending on the model, we can usually adjust all or a few of the following:

1. Preload: spring tension based on weightelectric scooter shock absorbers factory

2. Damping: the speed of spring contraction and rebound

3. Compression: deeper level of damping control, mainly controlling the speed of spring contraction

4. Rebound: a deeper level of damping control, mainly controlling the spring to return to normal speed from the compressed state

After you understand which parts of the suspension can be adjusted and how to adjust, you need to take out a piece of paper and write down the current settings to prevent the adjustment from breaking, and there are ways to restore the original settings.

Generally, for economic gain, manufacturers try their best to control cars. Therefore, the original suspension settings are generally not very poor. Compare the current setting with the original setting.

Before you try to adjust and set your own suspension, you need to make sure that when messed up, they can be restored to factory settings or their previous settings.