you can apply for visa and see if it is approved and enter, they might ask some question when you arrive but you can show documents that your ban has ended after 5 yrs
Maybe check with Embassy or Immigration, what visa will you try to enter on and from what country? Regardless it will come up in immigration system whether it’s been 5 yrs or not and immigration will take a look at your file at each step
Do you have legal custody in Thailand and India? If so then you would want those documents in case any issues arise - also a consent letter from the mother - since you have asked this question many times, you might want to consult a lawyer if the mother did not consent custody and the child was removed from Thailand without a court order, your sons mother would need to go to a notary and give consent with her information and sons information