These are my thoughts, and they aren't gospel or anything, just what I would try...
1-quit the beans and rice. Even a little on occasion can slow you down. If it's worth it to you to lose way slower, then eat them, if not, cut it!
2-are you eating enough? Breastfeeding a babe (congrats btw!) is a priority to your body. If you aren't eating enough your body is going to try to conserve every fat store it can for that kiddo.
3- I personally wouldn't IF with a breastfeeding 6 month old. After a year or two, maybe but at 6 months I wouldn't mess with that.
4- Do you go for walks? Either on your own or with your little one (a sling is great for this too, happy baby and extra weight to carry!) I would add some walking in. I realize you are busy, but even a 10-15 minute walk after dinner every night will help your sleep and your hormonal response. You may find that alone will jump start you!
Like I said, I wouldn't try to majorly IF, but as long as you listen to your body, you could certainly cut off eating a little earlier at night. Say, eat dinner, go for your 15 minute walk and then switch to hot tea (or tea with coconut oil, which is what I would recommend)for the evening.