IVF. There are only 2 options, assuming your previous surgery worked. Ivf (in vitro fertilization) to get pregnant without using the tubes. Or a repeat surgery to try to open up the tubes.
IVF or reversal. Ivf is the more popular and practical option for many couples presented wtih the same issue (having had a previous tubal ligation and desiring a child). Tubal reversal may be a possible option depending on a variety of factors (female age, type of tubal ligation performed, length of normal tube remaining, presence of other infertility factors such as sperm count, etc.).