If you are prone to injuries then I would simply drop all workouts and just concentrate on building volume of easy miles. I have a friend that never does any kind of workout because he hates them but knocks out 2:45 marathons based on easy running and lots of long runs.
I limit workouts to a specific training window before key races. Maybe 6-7 weeks with 1 or 2 workouts a weeks and 2-3 recovery weeks inbetween. I'm training for a marathon end of April, first workout was last week, will do another 1 or 2 next week, then a 1 week break. Will repeat that cycle another 2 times before taper.
The thing with workouts is they have very high injury risk, quickly lead to small improvements buy very quickly you get diminishing returns. A vast majority of performance comes simply from aerobic volume (and weight, and genetics). So a small amount of quality runs goes a long way and more just gets you injured. And however much quality you do you will never see the potential of consistent high volume. You also loose the benefits of workouts quite quickly, while high aerobic load leads to long term adaptations.
If you are a low volume running that tries to do several workouts a week but gets injured then droppi almost all workouts and increasing volume will improve performance and reduce injuries.
Another friend was doing 40mpw and 2 workouts consistently, but always ended up injured or blowing up in a marathon. He stopped all workouts and increased volume to 70-80mpw , has gone 2 years without injury and got his PB from 3:50 something down to 3:18 and achieved his dream of qualifying for Boston.