*Situation 1: The action of fixing has happened 10 times until the present. I can use either tense :
a. I tried to fix it 10 times. But it is still not working. Could you help me fix it?
=> I am reporting/ narrating what I did before I asked you to help. The sentence put more emphasis on the past actions.
b. I have tried to fix it 10 times. But it is still not working. Could you help me fix it?
=> Now, In the present, there are total 10 times of me fixing the computer in total. The sentence put more emphasis on the the present.
*Situation 2: The action of visiting has happened 2 times until the present. I think I can use either tense.
a. I visited Thailand 2 times. It is a nice country. I think you should visit it once in your life.
=> I am reporting/ narrating my past visits before I gave you an advice. This sentence puts more emphasis on past actions.
b. I have visited Thailand 2 times. It is a nice country. I think you should visit it once in your life.
=> I want to say that now, in the present, I have 2 times of visiting Thailand in total. This sentence puts more emphasis on the present.
If so, when talking about repeated actions until now, I can use either tense. Are my opinions correct?
Thank you.