If SPARX has helped them, keep up the good work and positive vibes by helping them practise their new skills in real life, every day. Or, if they feel confident enough, ask them to share what they’ve learnt, or simply remind them to stay on top of their skills regularly.
If they’ve completed all levels and they’re still not feeling better, that’s okay! It just means their situation needs some personal time and attention. Talk to them about potentially getting some professional or medical help.