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Don't listen to those. They're phishing scams. If you see anything like that, steer clear. Don't give your info to anyone offering any sort of contract (even if you're absolutely sure they're legit), otherwise, you're just walking into the hands of a scammer.
edit: even if they were legit, it's far more profitable (albeit more difficult) to self-publish. Contracts only sign away your rights to your own work, taking away the majority of its value from you.
My opinion? Branch out to other websites. There's nothing saying you can't. Royal Road is a good one that I myself have been looking at. Making a social media account to link them all together wouldn't be a bad idea either. Just make sure to update it along with your work.
I also saw where you said you wanted to make a manga/comic of your novel. Try making a youtube for that, since I've seen a lot of manga channels do fairly well there. Plus, it's got the added benefit of branching into something big for animations as well (take, for example, the immense amount of undertale fan-animations).