How do you write a good welcome message?

Hello there, I'm curious to know your thoughts on crafting an effective welcome message. As someone who works in the cryptocurrency and finance realm, I understand the importance of making a strong first impression with clients and colleagues alike. So, how do you go about writing a good welcome message that is both professional and inviting? I'm particularly interested in any tips or strategies you might have for tailoring the message to different audiences, whether it's a new client, a member of a professional network, or simply someone joining a community forum. Additionally, I'd love to hear your thoughts on the balance between being formal and approachable, as well as the role that personalization can play in making a welcome message stand out. Thank you in advance for sharing your insights.