There are many ways to support people with mental support you can either ask them about it if they need more support on some things like maybe doing them a favor or asking them how they are going as this keep them motivated to keep going and show them that they are making process. We can also support them by becoming a mental health worker/carer and this could help them as you know what you are doing and what affects them and try to develop something that could try and guide them in the right path. You could also join mental health organisations like Mental Health Australia, Sane Australia, Grow, Beyond Blue, etc. These are just some of the few organisations that there are here in Australia. This can help many people including yourself.