The most useful tip I can give anyone is to be in close contact with the language. The student should immerse in the language as much as possible. Using apps, trying to speak to native, including songs in Spanish to their Spotify lists, watching videos or films in Spanish or just trying to think in Spanish. Whatever it makes a student closer to the language is an excellent resource.
I recommend that they continue practicing Spanish through movies, series, podcasts, songs, since with these methods they will be able to continue learning in a didactic and interactive way, and if they can, practice with people who are also learning a new language just like them, so that they support, correct and learn from each other.
A very useful way to practise Spanish is to get a Spanish penpal. There are many sites online that match you up with penpals in any language you’re learning. You can start off by chatting via email or even WhatsApp, and then as you get more confident, you can move onto video chatting.