Not sure what do you mean by a "proper broker" but If you're referring to Over-the-counter (OTC trading) to buy/sell large amounts, then you have Circle, Kraken OTC or ItBit.
If you just want alternatives then for Binance (crypto-crypto) then you have Bittrex and Kucoin. For coinbase (fiat trading), you can use Coinmama, or BitPanda, both support multiple payment methods.
When we do talk about "BROKER" then for sure he do try to compare it with forex brokers but here on crypto its just a typical centralized platform but all are just the same in concept.
They do just differ on coins or assets that being traded of.
On op,youre currently on the right track when it comes to trusted and reputable exchanges as of this moment.So better stick with it.