What material are you cutting?
If it's thick then multiple cuts might be better.
Try different angles of the blade to the material.
If it's flexible then bending it while you cut can help.
Be extremely careful with such a knife.
You will need your fingers and hands longer as today.
Cutting with a X-acto knife needs some practice.
The materials you cut may not be as easy as you would like.
Also the kind of blade you use can influence the result.