Lost motivation after race

If you haven't already, register for the race you plan to do.  Once your money is paid and the race is on your calendar, you have no choice but to start training.   Good luck!

After my first sprint triathlon this year, I noticed that I felt really unmotivated to train about a week to 10 days after the race.  One day I woke up and found myself more unmotivated than I had been in months, and I couldn't stomach the thought of getting in a workout.  So I took a day off, then I felt the same the next day, and then a third day in a row.  I was surprised by how unmotivated I felt.  The feeling was so strong, that I was briefly afraid that that was the end of a very short lived triathlon career.  On the fourth day I felt the same, but forced myself to get in a workout anyway, and instantly felt better, and by the next day was ready to go again, and got my eye on another race.  I think that I was just so fatigued from my race, and hadn't allowed myself enough rest after the race, that my motivation waned.

Since then, I've completed two more sprints, a half mary, and a half century, and I found in each case that fatigue and lack of motivation sets in 7 to 10 days after a race.  I've decided to give myself those three days of rest, then get back at in regardless of motivation.  In each case, the rest is great, and then the motivation kicks in after the first workout back.

So given that, I echo the suggestion to sign up for another race, give yourself some rest, then get back in to a workout and see how you feel.  Since you mentioned injuries, be sure to take care of yourself, and take additional rest if you need it.
Erica