Then allow those who might actually have some solutions to reply. There’s no need to pollute a Q&A thread when the OP is looking for something specific. Or, you could ask for more clarification if the question is vague/needs more details.
As to the original question, if I understand correctly, you are trying to open the game with Pest Control’s Discord, correct? I have heard the complaint from some that their performance in Realm can be crippled with Discord running in tandem. Perhaps you are experience this on an extreme level, where Realm doesn’t even launch?
I too, don’t use Steam to run this game, so I haven’t needed to find solutions for myself. People have asked similar questions on the forums, so I’d check out some of their solutions whilst you wait for someone more knowledgeable than us on the matter.