I’ve used E*Trade for over a decade. I’m not a day trader, more of a buy and hold guy. But I’ve never had any difficulty with access to make trades when I wanted. Recently I’ve consolidated some old 401k and opened a ROTH IRA on their platform.
Transactions used to cost about $7 per trade, but now they are free for stocks listed on the NYSE, Nasdaq, and I believe the ASE. If you want to dabble in the pink sheets, they’ll charge you for those transactions.