It depends on your continued goals. My idea behind the V-Diet is for it to be a temporary but fast way to drop fat quickly, and that it’ll help get rid of bad food cravings etc. so that leanness is easier to maintain. If the main goal or continued goal is fat loss, then you can stay on the new V-Diet plan for a longer period of time (it contains a solid meal per day.)
But choosing something like 5/3/1 doesn’t work well with a lower calorie diet. One is for those who mainly want to get strong, one is for rapid fat loss. You’re feeding your body one way and training it for something else. That’s what I mean by incongruous. While you certainly don’t have to gain fat to get strong, at least a maintenance diet would be best for a strength-focused training plan.
A follow-up plan would depend on your future goals, and we have a ton for just about any interest. Diet-wise, this article contains some guidelines for long-term eating: https://www.t-nation.com/diet-fat-loss/simple-diet-for-athletes
For training, if you like the V-Diet style of workouts, look into Chad Waterbury’s archives at T Nation: https://www.t-nation.com/all-articles/authors/chad-waterbury You’ll see a lot of overlap in his training principles for other goals and the plan he helped put together for the V-Diet.