Perhaps you have seen the article 200 proofs that the Earth is not a globe. Google it and give it a read.
What you could do is start posts where you address each one.
This is the article that probably most FEers would point to as being convincing. Hence, if you addressed its claims you might start some robust discussion.
I’d certainly play devils advocate for ya.
BTW, don’t feel bad. I’m a scientist too, and get the same response. When an expert shows up here, the confidence and bravado that is normally present in FE debates seems to hide for some reason.
Of course, I can be kind of a dick, which doesn’t help really 
200 would simply be too much for me to address, I don't have time for that. And frankly, I'm thinking that if I were to, I wouldn't really have much of an impact on anyone. Although, if there are any that stick out to you as particularly convincing, I'd be happy to address those. And as ChrisTP points out, there is someone who already made a pretty big dent in the 200 "proofs."
Spacex launced a falcon heavy to space earlier today by the way. My question to you is why would Arabsat (Arab telecommunication company) pay SpaceX 90-150 million dollars to launch their satellite into space if this is all a conspiracy and satellites don't exist? If the launch was all for show, that would be such a waste of money and most certainly would not be in their interest to do so.
Well, arabsat supposedly paid that much. Did you actually see the money exchange hands? We don’t necessarily know exactly what their interests are. If they’re willing to stage rocket launches, and participate in lying to the public, perhaps their interests are not so transparent.
Indeed, considering all of NASA, including all its employees, which must include the families of these employees, and the related agencies in the government, all those employees and their families, are involved in the biggest conspiracy of all time, it is not difficult to imagine that arabsat is involved too.
In the case of large projects like funding a rocket launch, money doesn't literally change hands in the form of cash, it's usually wired. Lets assume that they didn't pay or paid spacex a substantially reduced amount. Why would spacex, a private for profit company, dump millions of dollars into launching a rocket into space? Moreover, why would
dozens of venture capitalists dump millions of dollars into funding a company that is just for show. They're explicit interest it so make money. Why would Jeff Bezos, one of the most successful people of the century, privately fund his own space company? Its because the
commercial space industry has the potential to make trillions! On the subject of conspiracy and lying to the public, why hasn't a NASA employee leaked the truth if the earth is truly flat? Everyone who works at NASA goes in strongly believing the earth is a sphere. I know this because that's what they teach in the universities across the nation. Imagine how disillusioned they would be when they find out the "truth." There would surely be a whistle blower and it would be all over the news. You may say that the news would cover it up, but to that I would ask why they didn't cover up Snowden's whistle blowing?
More on satellites: here's a guy who takes professional photographs of satellites. This is also something you can do yourself with the proper equipment and conditions.