Look for a reliable broker with a proper regulation. This should be the first criteria.
The next criteria obviously can be the trading conditions like Spreads, execution etc.
It is easy for you to figure out which brokers offer the lower spreads, look for this info in myfxbook spreads or Forexfactory spreads.
I’m looking to open a new account myself for my new scalping strategy (Profits are as low as 1 or 2 pips too) So needs a broker that has real tight spreads.
From my initial research, FP Markets is looking good. Waiting for feedback from rest.