Hi OP,
DS2 is a bit like this. DS 1 the opposite, so we really notice the difference. DS 1 is out of the house with friends, at sporting activities which sometimes take him away form home for weeks ata time, doing internships etc.
After GCSEs DS2 had 2 weeks work experience (which were pretty hectic, to be fair) and a few days away with us. Apart form that he has mooched in PJs. I don't want to push him, but don't want him to turn around after the holidays and realise he;s wasted 3 months. That's a LONG time to waste. So I booked him onto a course for a week, in a subject I knew he loves. It involves some prep from him, which he is starting to do. I also picked up some gym equipment from Freecycle and set him up with a daily work out routine, which he is pretty much sticking to. And I've encouraged him to go to a gig with some friends. He's seen no one. To be fair, he tried, but his 'mates' are even less motivated than him. Can't be bothered even to go to the cinema.
He's had a couple of family outings to the cinema and into town. Again, it's not much but it breaks up the 24 hours in PJs routine. Most teens don;t object to an offer of going to get a burger somewhere, then while you;re there you can just squeeze in a visit to something you think he'll like.
DS is not doing much, but at least he's attempting to get fit; doing a bit of music towards his summer school and by the end of the holidays at least he'll have done work experience, been on holiday, done a summer school and done his own keep fit programme. Most of the time he is slobbing in PJs in front of a screen, but breaking it up occasionally has just stopped him from sliding into the pit of demotivation. Can you structure a couple of things into the holiday for him? I just chatted with him and said I didn't want him to regret wasting the free time as he may never have such a long break again. That focused him a bit, and then we looked at summer schools. There will be coding, music, art, sports, maybe even gaming summer schools around. If he;s going to game. he may as well learn how the games are designed and meet others who game.