right or left handed?

Possibly right handed, I keep doing that thumb test to see if I'm cross dominant, but my slight farsightedness makes getting my tumb in focus difficult.

I mean ambidextrous is pretty easy to figure out if you're able to write letters of comparable quality. That and switching between hands to pick up items without hesitation would be a good indicator. If you find yourself favoring a side of your body to lead with that would also tell you. My father is left handed, but in the 1950's is was actually scorned to write with your left hand, so he was taught to favor the right hand. That being the case instinctually my dad leads with the left side of his body when performing tasks.

Cross dominant is different than ambidextrous. Cross dominant is when you've been raised with your non-dominant hand so it's more effective in certain tasks despite being naturally weaker

When I cross my hands my left thumb is on top but I don't think my left is dominant. I can do quite a few things with my left hand but that's because the exercise systems I like train both sides of the body.