He's still young, and you now have awareness.

Its way better to realise this and be able to make changes or support him differently, than to realise it when he's an adult. Or not realise it at all.

My eldest has a lot of trouble with emotional regulation, attention and anxiety. I had OCD and PPD when I was pregnant and for a long time after he was born. After I got better I had his sister, and she's sensitive but doesn't have the same troubles as her brother. I totally understand how you feel knowing you may have contributed to his delays, it's such a tough feeling, especially when it's like the "damage is done".

But I promise it isn't. My mum had mental health issues throughout my childhood(she still does too), and my brother and I both have a lot of difficulties from that emotional roller coaster. She never sought help or addressed it. You and I have the advantage of awareness and willingness to do our best with help. Our kids will be much better off thanks to us trying every day. You've got this

(Also covid lockdown is not your fault at all, and lack of socialising was unavoidable then)