I'm not sure how long you've been working with IG, but if you're not that experienced you should be using ipv4 proxies, regardless if they're residential or not. Ipv6 require you to handle the accounts with more care, and are more prone to getting disabled.
Actions that were good 6months ago, easily can have consequences on your account today.. as their algorithm keeps getting built up, they've been more strict on actions, especially ones which portray being automated.
I can see by your screen shot that you're doing approx 500 follows a day, and it looks like on top of that following accounts on the same day. Doesn't look like you're liking any pictures. Those are pretty good signs of being an automated account, no regular person is going to follow 500 people, without liking any pictures, and am following more people on top of that.
I would suggest if you're going to go with 500+ follows a day, to get some HQ residntial or mobile proxies.. preferably ipv4. I won't comment on v alar accounts, as people seem to have mixed views on them.. I have some accounts that I bought from him over a year ago, that are still running fine, but I heard that the quality of his accounts have gone done.. i don't know, as I haven't bought any recently from him.. but I don't believe it's your accounts if they've been working for 6mo. Just match proper amount of actions with the appropriate proxies. Some proxies can handle more actions, some less... And they do get flagged after a while if people on your subnet are abusing their proxies.
What are you using the accounts for might I ask? Niche growing? Aff-marketing, CPA?