It's better if you just focus and be honest about your sportsbook rather than ask someone how to gain a trust. If your sportsbook are good, have a good odds, contest, honest and very responsible to solve an issue, I don't think anyone will avoid your sites.
I also support what you say, all this covers everything that a player needs, and what is one looking for as a player? what I have said before, that there is a good RTP to attract more, that there are no problems at the time of the deposit (it is a very rare case, but it must be said) and especially in the withdrawal of funds (common case) that Nobody likes to wait for their withdrawal and if the withdrawal does not have any associated fee, I think they would be earning heaven as some casino platforms do.
I think that support on all platforms should be 24 hours a day, because when we are in a physical casino at all times there is immediate attention, I think that online casinos should also have it.