I'm a DM for in-person games and a player on Roll20 because usually I'm the only DM available in real life. Nonetheless, I have a few tricks I picked up when applying for games here. Every DM is looking for something slightly different, but, in my experience, good applications have these three cores: show the DM you care, show them something interesting, and show them you're probably not a terrible person. SHOW THE DM YOU CARE Read the entire LFG listing. Follow all the player application instructions they request, right down to formatting. In your application, mention a few things from the LFG listing that piqued your interest. If nothing piqued your interest, you probably shouldn't apply for this campaign in the first place. If possible, create or modify your character concept to fit the DM's campaign. Indicate that you're the kind of player who respects the game enough to show up every week, assuming you can work it in without it sounding forced. If you're not that kind of player, respect the DM enough not to apply to long-term games. Play one-shots instead. SHOW THE DM SOMETHING INTERESTING In most cases, this will be in your character concept or backstory. As a player, I once ran across an LFG listing for a group looking for a DM. I very nearly applied even though I knew I couldn't handle running an extra campaign. Why? Because of the short, tantalizing character backstories. They were only a paragraph long, but there was just enough open-ended mystery in them that I knew I could build fantastic stories around them. Ever since, I've included a mystery that I don't know the answer to for every character in almost every player application I write, unless the application instructions don't allow it. My invite count ticked up afterward. Besides, if the DM pulls on that mystery, you'll end up having more fun. SHOW THE DM YOU'RE AN ALL RIGHT PERSON Mostly, this is going to come down to maturity. Older DMs are going to look for more mature players because having obnoxious and/or self-centered people in your group is terrible. Maturity doesn't matter as much if your DM is young, but be careful as a player with such DMs. An immature DM is often worse than an immature player. In general, though, follow the same rules you would with in-person socialization. Sound self-assured, be polite but not obsequious, and don't try too hard. Also, indicate in your application what kind of player you are, such as what your favorite aspects of roleplaying games are. Do you prefer combat or RP? Are you an active player? DMs want to know this kind of thing, and many will include that kind of question in their application instructions. If you do all that, you'll have a better time. But, obviously, DMs get a ton of applications on Roll20, so don't take it personally if you don't hear from them. As someone else mentioned, apply to a lot of games all at once to increase your odds of getting an invite. It's better to have too many invites than too few. And, no matter how much you want to play, DO NOT ACCEPT AN INVITE TO A CAMPAIGN YOU DID NOT APPLY TO. In my experience, that's a huge red flag. Every DM who reached out to me blind turned out to be horrible in one way or another. I don't know why. There's nothing inherent in the act of reaching out to a player that guarantees you're a bad DM. I suspect it's simply that good DMs are choosier when they're gaming with strangers, so they don't send out blind invites like that.