I'm not trying to be confrontational or anything.
Neither am I

Bagels done a great job with the OP, I'm just pointing out some potential issues that I see.
Bagels said:
1) A mental illness, by definition, impacts ones ability to carry out the activities of day-to-day life. Preferring not to be in large crowds is not a mental illness; being unable to leave your house because youre terrified of people, on the other hand? You might want professional help with that.
Is this definition correct? What about someone that kills themselves and nobody had a clue as they seemed perfectly fine and were carrying out activities of day-to-day life? Did that person have a mental illness? What about someone that has a brilliant life but still feels absolutely horrible? Can that be a mental illness?
just want people to go see a professional first instead of self-diagnosing and self-medicating, which is a huge problem.
Do you think things like the PHQ9 should be removed from the OP?
Personal responsibility is implied by even admitting that you might have a problem.
If someone admits they have a problem but decide to do nothing about it, do you still think they are taking personal responsibility? What about if they decide to fix the problem by drinking lots of alcohol?
One is weighted by scientific evidence, peer review and alternative medicines are not. The cost vs risk has been taken into consideration. I don't get your point. Believing that something might help is not the same as having enough evidence of efficacy.
I'm making a wider point. Different people will come into this thread with different levels of knowledge and different purposes. Some will have severe conditions, some mild, some none at all. Some people will be unsure. Some will have limited knowledge, some will have misconceptions. Many will literally know
nothing about mental health.
Speaking from personal experience, at the age of 23 I didn't even know what depression was, I'd only heard vague mention of the term, I equated it to unhappiness, not only did I not even know if there were possibilities to treat it, I had no idea it was a mental illness in the first place. That's me, living in a first world country and having a computer science degree in my name. Maybe I'm just stupid, but more likely is that many people, including people that have mental health problems are
completely uninformed about mental health,
This is why I say don't make assumptions about people reading this thread. Don't take for granted that they know anything or have any idea of the seriousness of their situation. It may sound obvious to say get professional help, but it's not obvious. To a person that knows nothing, you need to back it up and justify it. Presenting explanations of all the various mental illnesses and the various uses, costs and benefits of the various 'therapies' maximises the usefulness of the thread, but also maximises the credibility of it. An obvious response to "Get professional help" is "yeah, whatever", especially with an illness that makes someone see the worst in everything.
Maybe the term therapy confuses things, and maybe the term alternative also makes it unclear. So for a moment just think of the term "intervention"
Whatever intervention you have can be used in different ways. It can be used for different purposes. It can be used in different combinations alongside other interventions. It has its benefits and risks. Risks are:
1) The level of damage something can do
2) The possibility of that damage occuring.
Taking meds as the example, theres some mild side effects which may occur. There are also some more serious possibilities, examples off NHS website:
"Long-term use of SSRIs and TCAs has been linked to an increased risk of developing type 2 diabetes. A study published in 2010 found that people who took these types of antidepressants each day for more than a year were twice as likely to develop type 2 diabetes than the population at large."
"Some people experience suicidal thoughts and a desire to self-harm when they first take antidepressants. Young people under 25 seem particularly at risk."
To give an example you can't directly compare meds with working out. Statistically meds have a higher efficacy in treating serious depression. However an individual may or may not be comfortable with those risks. Exercise has lower risk or you could say no direct risk. Also exercise can be done in addition to meds, so it's not necessarily an alternative, more a complement. Coming back to purpose, a person may do exercise not to cure their problems, but to make an improvement which is a more modest aim. They may consider other interventions to get to that point of curing the problem. Comparing again to CBT which has a high efficacy but a lower risk, there may other issues of a delay of months or maybe someone can't even afford it.
You also need to consider things going wrong, not just things going smoothly. People may not want to PM someone or make a post, they may have a phobia of going to the doctor, they may have no access, they may be misinformed, they may already be advised by their spiritual advisor to spurn the system and meditate their problem away. It's not just presenting people ideas on how to help themselves, it's also an opportunity to give them awareness of the dangers.