Off time is usually used for two main purposes. First is to allow the body to sensitized again to the items you have been using, if the body becomes desensitized to such things. The other is to allow the body to recover from the use of suppressive agents, doing PCT to aid in a successful recovery.
You do not need to worry about the second reason - TRT means you are never going to recover. The first depends on the item you are taking. I am not sure if LGD4033 need a sensitization break or not, hopefully someone else will chime in for you. I have moved from one item to another without any break, since I am on TRT as well. My only true break times are when I shift from a cut to a bulk or bulk to a cut - need to "soak in" time for the body to get used to the new normal so it does not try to shift back to where I was before the cut or bulk.