Work your way back in, assuming your quad is fully healed:
Start with a 2-3 sets of squats (10-15 reps) and traveling lunges around 85% relative intensity the first session. 3-5 days later, depending on soreness, the same with rumanian deadlifts and r spit squats/bulgarian split squats.
Session 3 and 4, increase the relative intensity and/or volume. Also, you can add in another movement. Session 5 and 6 increase the relative intensity again, to close to 95%. Session 7 and 8 you should be good to go full out, assuming there is no abnormal pain in the injured area along the way.
BR
Note: relative intensity refers to % of a rep max.
i.e.: If your 10 rm for squat is 200 pounds, an 85% relative intensity would correspond to 170 pounds working weight for 10 reps. 90% would be 180 pounds for 10, 95% would be 190 for 10, etc.