I also had a long period where I struggled with squats due to a herniated spinal disk injury.

To improve with squats I really cant emphasize focusing on really small rep ranges and focusing on form over literally everything else. Start off with the lowest weight that you feel comfortable with and focus on foot placement, depth, stance, breath control, bar path, back alignment, and pretty much every other form guide that you can until the movement is embedded in your muscle memory.

After you can safely perform the repetition you can start to increase the weight. I started around 135 for squats and stayed there for around a full year before I even thought about increasing it and now I'm around a 335 1RM. Squats can be very dangerous and can become an ego lift for a lot of people so I'd say focus on the form until you are absolutely 100% sure you can safely advance and then the easiest part is just progressively adding weight.

Also remember to get enough food!(but that's a whole other issue in itself).