1.) Pacing is really tricky! I do long scroll format, which actually makes this a little easier since I have to do at least 15 panels an episode, but when I was doing page and only had like 5-10 panels to get something interesting out it really was hard to hold an audience. It may be helpful to release more than one page at a time, some people update like 3-5 pages per episode, although it may be less times a month. that's something you have to figure out on your own, by experimenting with it and asking your audience what they prefer. But, people do expect every update to have something of value. It doesn't need to be a huge plot development, but it must have some sort of value, even if it's just aesthetic.
Doing webcomics makes you super aware of the pacing in other media and in other comics, and I think that if you read what other people are making it's a really good study to just take notes of how they're doing it. Like how do they leave some sort of hook at the end of the update to keep people coming back? How do they condense lore information that would have otherwise been a few episodes of plot dump? since I only update 2x a month, if nothing happens for 50 episodes, that's 2 years of nothing, and basically the death of my comic, so I've been really trying to pay attention to that.
2.) this is very common, you're fine. I do this, too, no one gets confused.
3.) When it comes to redoing all work, while I do think there's merit in redoing your first 3 episodes, there really isn't a point to redoing all of your old work for no reason other than you improved. The first 3 episodes are what's going to really hook your audience, and so they're the most important. But as for the rest, it's most important that it's legible, not that it's the best art ever made. So if there's legibility problems and confusing areas, absolutely go back into it and fix it. But if it's just less polished, you can leave that for when you truly actually have the time to fix it (which will probably only happen if your work got popular and you had to take it to a printer).
4.) So like this is more personal opinion from a straight perspective, but while it makes sense to use the LGTBQ+ genre if your story falls into that, I think we should be more careful about how we use social media hashtags that are meant for visibility for people--like real ass people, not fictional people--and the struggles that they're going through--real struggles, not about the fiction you wrote. So since you are from that group, it's fine to use that hashtag. It's meant to highlight you. But for me, a straight person, I should probably leave it for people that need it. There's no hard set rule about this, but it's something I feel very strongly, especially after seeing how people drowned out activism during Black Lives Matter, speaking over the people who were actually trying to protest and get things done because they wanted to advertise their shop and their products and fictional characters.
If there's a place like a discord where people are seeking comics with LGTQB+ characters, or if there is a list someone is making of stories with that, then yeah, absolutely let them know your comic will eventually have that. It's up to the reader at that point to decide if they want to wait to see who it is.
But as for using the genre tag, I personally wrote a comic before my current one where the main guy is bi, but because it wasn't like he walked around with a sign on his face, you really couldn't tell. (in fact, it was a plot point he didn't like to be labelled, so it didn't make sense for me to label him or for him to assign a label to his feelings, especially since everyone else around him knew his dating history.) So while at first I was like, yeah, I'll use this label in comic places because it has a character in there, I realized...that's not enough for my audience's expectations. Same thing when I was writing a comic where it was a sci fi and my starcaptain was a lesbian, but I never got to the part where her wifey shows up, like it just wasn't really worth taking advantage of a minority group to try and capitalize on them. Especially since like I go the library a lot, and maybe it's just my library, but it is not hard to find LGBTQ+ fiction anymore. It is 2023. I don't deserve a gold star just because I wrote a few LGBTQ+ people. I have done nothing different than most writers who are writing today.
So like if you feel like your story matches other LGBTQ+ content, then use the genre all you like, it's not like there's a genre police or a hashtag police for that matter. But if you're feeling like you know what the audience expects and that you're not giving them that, maybe ask people's opinions who write in that genre what they think. It's in the end a personal decision, and I don't think people judge other people about what they decide to do, ultimately.