Hey Countryck22,
Like you, I lost a lot of weight on IP and have gained some of it back. I can't tell you what to do, only you can decide that.
FWIW, I have tried other plans to lose. As Stephascope said, many other plans are too liberal and I find myself triggering cravings and binges when I eat too many carbs. The structure of IP keeps me in line. I don't go to a coach, but a good coach may be helpful.
I guess this decision comes down to self knowledge. People lose weight on both plans. How carb sensitive are you? Do you have the commitment to get back on a strict plan?
Whatever you do, if you do it with commitment, you know the weight will come off.
I wish you all the best!