The problem with practising is that if you practise something incorrectly, it gets ingrained, and can be nearly impossible to correct later. I think that you really need to have someone - ideally a native speaker, or someone with really good English skills listening and giving you feedback. If you don't, you risk ending up like a chat group I once listened to. I think those people thought they were speaking English, but to me, most of it was incomprehensible. They had practised in their own group, but ended up speaking a weird dialect that they invented.