I've got a 14 year old DD and 13 year old DS (ASD) and what DD has only just met people for first time since lockdown despite normally being very sociable. DS doesn't meet people normally. Both are quite happy but same issue with needing things to do.
DS - its mainly our pets, we have indoor rabbits, a cat and 3 silkie chickens and DS spends a lot of his day talking to them, feeding the rabbits and chickens - the rabbits sit with him on the sofa. Other than that for him its just ipad / TV and occassional baking. I've just ordered a breadmaker he asked for and he's super-excited about that.
DD- Again pets, also just got a sewing machine, has repainted her room, got new flooring she wants to lay, paid her to help paint / garden at our old house which she spends largely on clothes, she makes pizza and English breakfast from scratch, paint by numbers kits, read the odd book, audible, Netflix, Disney films and studying more things she's interested in e.g politics programmes on BBC iplayer. She runs each other morning and goes early and sees deer and squirrels.
Over summer it was rock climbing, swimming, coastal walks, gorging, alpaca walking, hotel stay, boat trips - think a lot of that will go though.
Hope you find something. Toys from when they were about 4 are always popular here too though no idea why - DD's been doing a Tigger colouring book. 