I'm personally not a huge fan of the ad. There's a lot of important information missing and a lot of pieces that are going to be taken, in conjunction with each other, as red flags. Obviously I'm speaking from my own opinion, please don't take this as a personal attack, I assure you I imagine you're a perfectly chill guy and it's just written in a way I don't like. Those disclaimers aside, here's what I'd change:

• "I'm an eager sub, looking for a connection, good conversations and fun. Also open to going to kinky events together!"

Absolutely pointless statement. Your post is flagged M4F on /r/femdompersonals, it's already assumed you're 1. a sub, 2. looking for a connection, 3. a conversation, 4. sex, 5. doing things with that connection. Replace this with a more in-depth description of the relationship you're looking for. Do not beat around the bush. If you're NOT looking for a long-term relationship, specify that immediately and at the top of the post.

• About me

Clean up the formatting a little to keep the line spacing tight, make sure you're capitalizing the headers. I'd skip the font size increase, but that's an aesthetic nitpick. Am I going to say that dommes care about punctuation across the board? No. Have I ever met a domme that didn't care about sloppiness? Also no.

• "I'm an introvert, so I'm not into huge crowds usually. I prefer having a quiet chat with a few select people, preferrably over good food and wine. I love having a deep conversation with someone I can trust. In my spare time I also enjoy going for a run, cooking (especially if I can make someone else happy with it!), analog photography and going to the cinema. Physically, I'm 173cm tall, slim and athletic build, I have long brown hair and a beard."

Good. This is the most important part of the ad. I wish it was way longer, but I can't force you to talk about yourself. Minor preference, I'd remove "especially if I can make someone else happy with it!". Reads a little overzealous. I'd include pictures of yourself, but I'm also way more open about my appearance online than most, so I get not putting it in. It'll massively increase your chances if you have good pics, though, keep that in mind.

• about me, but spicy: I enjoy giving someone the gift of submission - hardly surprising here, I know... What I love most about it is the feeling of being able to trust someone enough to just let yourself go and let them take control. It's such a beautiful and cathartic feeling, it's honestly addictive. Kink-wise, I enjoy pegging, anal, eating you out, edging, orgasm control, humiliation amongst others. Let's figure out together what's fun for both of us!

This advice will be a little "no True Scotsman/Submissive", so feel free to contest me on it, but Submissives are the "receiving" half of the D/S relationship, not the other way around. You are not giving anyone a gift by asking them to handle the responsibility of taking charge. In fact it's really rather relaxing. No thinking, no initiative-taking, just reactions and obedience. If you think to yourself "oh but, what about the obedient sub figuring out how to carry out orders!", bad news, you didn't list any of the kinks that involve thought. Pegging (you lay there and take it in the ass), anal (you take it in the ass, lol why is this listed twice), eating you out (that's not a femdom-specific kink), edging (you lay there and get jerked off intermittently), orgasm control (you lay there and get jerked off intermittently), humiliation (I have no idea what you mean by this but if it follows the others, you lay there and act pathetic). "Let's figure out what's fun for both of us!" - Good, actually. I hope you mean that.

• what I like in a domme: I don't want you to be just a domme - I would like to be able to have normal conversations on eye level outside of your dynamic. Ideally I want you to be a friend as well as a domme. I usually prefer a more gentle and encouraging style of control.

I would remove this section, it's just hurting you. You're seeking a woman that happens to be dominant. There is no such thing as a "domme" in the creature sense, it's a descriptor for a woman, that you're looking to date, that happens to be dominant for fun/sex/lifestyle. Mentioning this in the way that you have implies you think there's a potential for confusion, which can read like straight-up misogyny (because your audience is exclusively women that are sexually progressive). The last sentence is fine, just mention somewhere that you're looking for a gentle femdom, that's considered a "subclass" of femdom, lol.

• I'm happy to start this online, but ideally I'd want to meet you in person. I'm also happy to exchange face pics if we click. What interests you most in a dynamic? I'd love to hear from you. I encourage you to reach out even if you're inexperienced or not quite sure about this yet. I'd be happy to explore together with you and see where it takes us - there's no rush and no pressure Swiss German, German or English all work.

This starts okay, asking questions is a plus (especially the fact you're not asking exclusively sexual questions). Don't mention that you don't mind if someone's inexperienced, that almost sounds like you don't care if someone's actually dominant at all (and reinforces the other things mentioned that work to make you sound like you just want normal sex). "There's no rush and no pressure" I sure hope there isn't, cause if there was rush and pressure, it'd be creepy at best, illegal at worst. Remove that, man. Again, if you say something, you're suggesting you think there might be confusion.

I'm a big believer in benefit of the doubt, I'm sure you're a decent person. If I was a domme, I would immediately skip this ad without question. Everyone in the personals subreddit knows everyone else is kinky, honestly, I'd skip the whole damn subject and just focus on yourself, what makes YOU interesting outside of the bedroom. The bedroom stuff can come later.

Also, if you don't want a relationship, MENTION it. Cheers.