Yeah, my mother can go full central Mexico accent, but revert back as soon as she phones her sisters. Same with an Argentinean friend of mine, you wouldn't notice he's from Argentina unless he phones his mom, lol. On the other hand, a friend's girlfriend is originally from Venezuela, has been living in Mexico for ~5 years, and her Venezuelan accent is still intact. The difference would be that her Venezuelan relatives also live here, and she still spends lots of time with them.
I think my only accent is central Mexican, which according to Rayis shines through my English
It makes sense since I haven't been able to develop an English accent, I'd need to live in an English speaking country for that to happen, I guess.