Difference between tenses

I know the uses of all tense and Keep it by heart .
But for these three sentences
I would like to be sure I understand these sentences correct

My favorite country is Thailand. I'am there four times

(can we use the present simple to express the( fact)
that i visit Thailand four times or this is Grammatically incorrect because (idintify four time)

The second sentence
My favorite country is Thailand. I was there four times
Is it Grammatically correct ?
use the past simple and Considerate the speaker didn't mention the specific time, but they do have one specific time in his mind

the third sentence
My favorite country is Thailand. I have been there four times
is it mean i visited Thailand four times and there is Probability to visit it again
thanks for your help