What you need is volume work with good form.
Watch that lumbar flexion too.
Here is a suggestion for a decent program:
Lifting heavy weights is good, but not when form is sacrificed really badly. Once you adhere to this advice, you will be squatting heavy again in a short while, then as the years go, you will thank me for this advice.
You coming here to ask for advice is very good. That is how you learn. If you have the chance, hook up with a more experienced lifter so that he can watch your from.
You are strong, keep it up!