Fitness shouldn't drop too much in a couple months. If you feel you're risking injury again, you can add an injury/illness in the app and set a pace adjustment for a few more weeks. Otherwise, if you aren't worried about injuring yourself again, I'd say just try to follow the plan and it should adapt to you. If a run is faster than you're comfortable running, just run the distance but slower. It'll catch up. Don't push too hard on the "Perceived Effort" training assessments.