The difficulty of avoiding a 7 day leg---and looking for our next cruise

Ideally, we would like to take a 14-18 day voyage, avoiding a 7 day leg as we found the final 7 day leg of our 21 day recent cruise to have a distinctly different feel than the first 14 continuous days.

However, in looking at the cruise calendar for 2019, I can see that it will be difficult to avoid a 7 day leg.

If anyone has any suggestions, let me know. My husband does not wish to do Antarctica and we are not interested in Asia/Australia etc at this time.

Sojourn is noodling around Africa early in 2019. There is a 16 and 20 days Cape Town to Male and then Male to Singapore on March 5, but there are others down there before

she takes off for Male I believe.