How to help my brother who’s 32, single and been jobless for 3+ years?

This is extremely frustrating. My brother has always been a great student, he has a degree in computer engineering but after he graduated he didn’t have any intention or put in any effort to find a job until one day he was contacted through LinkedIn by a recruitment agency and got his first and only job. He stayed in that job for a few years, shared an apartment with a friend but shortly after COVID-19 he decided to take a three month break from work and resigned from his job. Moved back to my parent’s house and been here ever since it’s been more than 3 years. He never had a girlfriend and all he does is sleep until 12PM and plays video games. Doesn’t pay any bills and has zero drive and ambitions in life. I live abroad and have my own life and family but this bothers me so much because I think my brother has so much potential I just wanted him to have some motivation in life and get what he deserves. My parents are both in their 60s and about to retire and worry about what’s going to happen to him when they pass away, my dad is concerned he might end up living on the streets. A few weeks ago my parents pressured him to find a job and he started crying saying that he has zero self esteem and confidence to go to work. When asked why he said he’s previous manager used to put a lot of pressure on him. We suggested therapy but he refuses, we suggested helping him find a job but he refuses, he refuses every attempt from us to help him. This situation is draining my parents. He keeps BSing them saying that he’s been applying for some jobs but no one looks for a job for three whole years without finding anything. As a big sister what can I do? How can I help him when he refuses everyone’s help?

How to help my brother who’s 32, single and been jobless for 3+ years?
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