Question about foundation and door of my house
Your question "how much chance i may need (to) repair foundation in the future" cannot be answered, because whether or not you choose to repair it is a choice only you will be making. The homes in my area have extensive history of foundation and slab floor cracking and movement due to expansive soil. Some people choose to take steps to remedy the movement, some live with it and engage in continuous plaster and stucco repair and trimming/rehanging of doors.
My home was built in the late 1950s and has undergone repeated wall, door, and floor repair, and a corner of the house has subsided considerably, but I have not yet seriously considered a full foundation rehabilitation.

Your question "what i can do" could best be answered by the foundation engineer you already spoke with. Strengthening and reinforcing a foundation on expansive clay soil to prevent future movement is possible and, in fact, is done frequently. None of the various methods is easy, cheap, or non-invasive.