Being fluent in speech but lost without your phone's keyboard does not make you a fraud. Speaking and handwriting are different skills, and the writing one is rebuildable.
Living in Shanghai for years and freezing on a handwritten bank slip is not a failure, it is character amnesia from typing. The slip needs a small fixed set you can relearn fast.
If your Chinese handwriting makes natives wince, it is almost never hopeless, it is three fixable faults: proportion, stroke order, and structure. Here is how to fix them.
If writing a Chinese diary on permanent paper makes you anxious, practicing digitally first builds the confidence. Here is how, with your data backed up offline.