I already purchased Founder’s Server : Exclusive Access1,2 so far.
but i wanna know if we can buy the same Founder’s Server : Exclusive Access more than once.
No. You can buy each of 1, 2 and 3, but none of them more than once. Steam doesn’t support buying the same dlc more than once.
You will have to wait till release in 3 weeks to get more TP.