1. Taking an interest in others
The first thing to do to maintain interest in an online conversation is to take an interest in the other person. Ask questions, listen carefully to the answers and make relevant comments. This way, you'll show the other person that you're genuinely interested in what he/she has to say.
2. Maintain eye contact
Even if you don't see each other physically, it's important to maintain eye contact during an online conversation. This means looking at the screen, not distracting yourself by looking around. Also, try to smile from time to time to show that you're comfortable and enjoying the conversation.
3. Avoid sensitive subjects
It's important to avoid sensitive subjects like religion or politics when chatting online. These subjects can be very controversial, and it's easy to argue with someone when they come up. If you don't want to argue, it's best to avoid these topics.
4. Avoid interruptions
When you're online, it's easy to get distracted by the many notifications you receive. However, it's important not to interrupt the conversation to look at these notifications. This will show the other person that you're not really interested in what he/she has to say. If you really must look at your notifications, excuse yourself before doing so.
5. Take breaks
It's important not to talk online for hours on end without interruption. It can be tiring, and the other person may get bored of the conversation. Take breaks from time to time to rest and come back when you feel better. That way, you'll be able to get more out of the conversation.