It’s a mix of general autistic things, and things I personally do as a cis-autistic. Autism presents very broadly so you’ll have to navigate what works for you! Feel free to suggest more in the comments.
- Develop a special interest and learn a lot about it! Tell everyone about it!
- Use obscurer words in your every day vocab. Examples; greetings, mayhaps, overmorrow, variegate, betwixt, whence.
- Stim! Examples; echolalia, repetitive movements, stim toys, music.
- Interpret things literally, especially when it’s coming from a stranger.
- Plan everything!
- Develop a more monotonous voice and/or flat/blunted affect.
- Accentuate your quirks!
Other common traits of autism are sensory/processing issues, meltdowns, and social clashing.
Idk if this is any consolation, but I’m a late-diagnosed cis-autistic, and if I hadn’t diagnosed myself first, no one would’ve realized I was autistic at all. So you can totally be and identify as cis-autistic without a diagnosis!