Synonyms for To sum up:

• adv.

  •lastly/last (adverb)
  • behind,
  • after,
  • in conclusion,
  • ultimately,
  • finally.

• Other synonyms:

  •adv
  • after all,
  • all in all,
  • at last,
  • at the end,
  • bringing up rear,
  • in the rear,
  • to conclude.