Maintenance is quite a balancing act.
There are many articles about maintaining your lost weight.
Good luck with your protein plan but do not forget vegetables.
My son and his wife are on Atkins every Christmas and always have plenty of vegetables to have with their protein. It is part of the plan.. They have kept from gaining over the years.
They have been married for 14 years this march.
They fit in their wedding costumes... they were dressed in Edwardian ( 1900 era ) costumes.
They are very theatrical.
Hope this encourages you to keep on with your plan..