How to avoid losing more money than you put into your account in MT4?

I want to ask you all a question on how to avoid losing more money than you put into your account by using MT4.

FXCM offers no debit balance policy but it requires $5000 initial balance... However, Interbank does not protect your balance although they offer mini size account for MT4... Any recommendations to brokers offer "no debit balance policy" as well as mini size account for MT4? Thanks.

How about just using modest leverage and appropriate lot sizing for risk management? Works with any broker

Both brokers you mentioned offer mini and some even micro accounts.

To be honest, I have never heard of anyone owing their MT4 broker more money. They system will close all your orders automatically if you even get close to a margin call. I would not worry about this. Plenty of more important things to worrry about.

There are plenty of brokers who offer negative balance protection.

I wouldn't say "plenty".
Some advertise that they protect your funds. But if you read the smallprint carefully, it often refers to the software's in-build stop-out level.

True negative balance protection means that in case of a black swan event for example, you won't have to pay any money that exeeded your balance.
But be warned. The fineprint also states, that you will get banned, if they suspect abuse of said protection. So don't get any ideas

True negative balance protection is impossible unless your broker is on the other side of your trade.

Well, as far as I know some brokers are obliged by their regulators to have negative balance protection and in case of black swan event they should bring the clients’ account balance from negative back to zero.
At least this is the case with my main broker.