Exercises to substitute DLs and Squats

I had a hip flexor injury probably from DLs and Squats and I had to take a break from them because if I put any pressure on my left hip, the pain is unbearable. I limp a bit whenever I walk but not as bad since it's starting to heal. I do stretches, put Icy Heat on it (not sure if it actually works),take Advil, and avoid intense heavy lifting that involve my hip flexors. I want to be able to still do lower body/full body workouts because the last thing I wanna do is neglect my lower body. The holidays are coming up and I want to be able to keep my muscle and avoid fat gain because of an injury. What are some good substitutes for DLs and barbell Squats? I can do leg presses and goblet squats but sometimes I feel like they are not intense enough. I no my main priority is to heal first but it's hard to have patience when you're stubborn. I normally do 2 types of DLs, Squats, Good Mornings, Hip Thrusts, and Kickbacks but I can't even do that. Even lifting just the barbell alone can cause pain in my left hip. I try to do a little bit at a time to test my flexor (like 1 set of 5 with just the barbell alone every time I go into the gym). My goal is to continue to build strength but kinda hard right now but I'll get back into it once I'm fully healed but my main goal is to stay in shape, keep my muscle, and avoid fat gain. I want to continue to build my glutes and shape my thighs but not sure where to start because right now I just feel stuck. My body has also been reacting differently since I stopped doing heavy lifting recently and it's also bothering my self esteem. I could really use some advice about what to do and how to heal quicker.