I get Instagram messages fairly often like this, and at times will play along just to see what the scam is exactly, how they are trying to approach things vs other scammers etc.
I wish there was something more I could do than post about these types of scams here. I can't believe they actually work but obviously they do.
There is sadly nothing you can do except post it on different forums at your own cost and hope that someone actually reads it and saves their own money from being lost.
But the truth is, your efforts are good but the ones who are going to get scammed are going to lose their money some way or another, because the ability to detect the scam comes from that user itself, it does not come from advice.
You can turn off your Instagram DMs - is that even possible? I dont use these social media which is full of "influencer BS" anyway so I dont know, check the settings yourself.
I do use Telegram, where similar PMs are received at times. I just block them immediately when I know they are not common with me on any group or a known contact.