Instagram SIM router, cellular data, mass access

Hey bro!
So far, I have managed Instagram directly from my mobile phone with 10 Android phones and 6 SIM cards.

The ideal configuration is to use an Android phone and SIM card ratio of 1:1, but according to our country's telecommunication law, only a maximum of 3 can be issued per person. I have 6 SIM cards, 3 issued in my brother's name.

To automate Instagram, I logged in 5 accounts on each Android phone, for a total of 50 accounts. I've been warming up my account very carefully over the past few months. In conclusion, none of the 50 accounts were blocked. (Hundreds of accounts were blocked to achieve this result)

Now I face a new situation.
50 accounts aren't enough for me.
So, I purchased 20 additional used Android phones this time.
But I'm worried because I can't get a SIM card anymore.

I purchased a single SIM router and connected it to 5 Android phones (25 accounts), the accounts were purchased from a BHW seller.

In conclusion, only 10 out of 25 accounts survived and the remaining 15 were blocked.

First reason for failure: Related to account quality.
Second failure reason: Too many connections attempted to a single SIM card.

I need your advice to solve my problem.
If you know anything, please reply.

Instagram automation was run on mobile, not the web, using Python and ADB.
We installed proxidize-android APK on each Android phone and used the change IP function.

Which country are you from that only allows 3 SIM cards per customer?
What modem are you using? Android phones?
How are you automating? Afaik adb does not have that possibility, are you using Appium on top?
Don't buy accounts. You never know how they were created or what they did in the past.
A lot of shady sellers sell the same accounts to 10 people or they sell the SMM accounts that are certain to be banned in a few days.
It is best to create your own accounts so you can trust them in quality and they don't get hacked or banned suddenly.