Great job!
Don't forget that you can continue to earn Rapid Rewards even if you cancel the card. Check the Partners page in the "How to Earn" section of the Rapid Rewards website. You don't have to use a Southwest CC to make purchases through the RR shopping portal or when you eat at RR Dining locations.
I switched my electric provider and got an extra 12,500 RR points for doing it (5,000 of those points were a bonus for having the SWA CC.) I will also get 1 pt. for every $1 spent on electricity through the provider.
Sign up for the Rapid Report and Rapid Rewards Newsletter and get 250 points for each.
And check the SWA section on flyertalk.com often to see if there are any new offers that can add to your point total.