I have been a member of this community for over a year now. I never had issues with an admin or any other staff member. I had some small issues with other players, but nothing major that couldn't be solved with a small conversation. My experience so far has been great and I cherish all those memories I built here. That for I am gonna list you a few tips, that I believe you will find helpful.
1: Value other players experience equally as yours. We are all investing time from our lives here, regardless if that time is many hours a week or just a few minutes a day. So regardless of your IC development, you should always stay polite OOCly, even if you come across a toxic person, getting on the same level won't make you better than them. Stay calm, stay polite and make known of their behaviour to the staff team, either by reporting in-game or by submitting a forum report thread.
2: Always stay in character and never mix IC with OOC. Separate your character from your real self, allow him/her to think in a different way than you. Allow your characters to make mistakes that you wouldn't do yourself in real life. Think of them as a completely separate being. We should neither portray ourselves nor embody their role as actors. Roleplay is often considered acting, but it's more like writing a story. We are witnessing the lives of our characters when their existence and personality come to life through interactions with others.
3: Your character should always think and act realistically always according to their experiences and development. Allow your characters to have fears and appreciate them as they can generate interesting roleplay.
4: Avoid bad examples. While I was new to this server, I tried my best to adapt in this new to me then environment. Many times I was acting like a chameleon, adapting to my surroundings and following examples that then I thought they were great. As time went by those examples were replaced by better ones and I discovered mistakes that I did before. It's not just the character stories we develop, but our roleplaying skills as well.
5: Take your time with everything and enjoy the journey. Driving from Los Santos to Paleto with 130mph in under a minute will give you a feeling that the map is small. Having a slower car or even driving slowly can make it feel like an actual journey. Enjoy the small details you will notice on the way or couple of songs you might hear on the radio. Make stops for rest or refreshments and toilet, or even have a conversation with the passengers of your vehicle
Also, take your time with your character's development. The more you rush it, the sooner it will feel like a game over as grinding won't make you look cool. There is a lot more roleplay around a rusty emperor, without plates and broken engine, rather than any supercar.
6: Don't be afraid to say no when it comes to offensive RP. If it's not the development that you seek for your character, then you have every right to refuse any atrocious actions. Being a victim of rape, for example, would change your character's life forever. Realistically speaking it's very close to a CK, I don't think anyone would stay in the same area or even city after experiencing that. If you ever decide to be part of it, make sure it serves a better purpose other than a group of players laughing in voice chat in discord. Gang members here tend to have OOC connections with each other as they communicate with each other a lot over discord. While I was experiencing illegal roleplay, I realized that some players cannot exist as a unit and always seek to be part of a team or group. Finding a common target often helps them bond with the rest of the members and I am not willing to ruin my character's development just to serve as common ground between them.
7: Lastly, report the wrongs bit don't seek punishment. In-game reports and forum player reports should have an educational nature. Taking joy in someone's ban is sign of toxicity. Try always to bring the reported party to the right path and make them understand their wrongs. This is a growing community that welcomes new members every day, so it needs a lot of support. Report any wrong behaviors but don't be revengeful, so the community can grow larger and healthier.