en_tn/lev/27/20.md

it cannot be redeemed any more

This can be stated in active form. AT: "he can no longer buy it back" (See: rc://en/ta/man/translate/figs-activepassive)

If he does not redeem the field

The time for redeeming the field can be stated clearly. AT: If he does not redeem the field before the year of Jubilee" (See: rc://en/ta/man/translate/figs-explicit)