Both my DC had unplanned gap years. DD decided to take a gap year the week before A level results and to defer her university place.
She worked at an International summer school at a local boarding school for 6 weeks then went solo inter-railing. She found solo travel hard. Having a full-on itinerary, staying in noisy hostels and getting very little sleep, constantly moving-on and having no one to share the highs/lows/worries with. She came home after 13 days.
Next she did 'Workaway' and lived in Germany for 3 months au-pairing with a German family. She loved it! The family paid for language school 2 evenings a week, she worked as a language assistant in the older children's secondary school once a week, she went on long dog walks daily, fed the chickens, picked the toddler up from nursery and helped around the house. She fell in love with Germany and the language. She has been back to the family since and done another workaway month elsewhere last summer. www.workaway.tv/video/107
Two weeks after returning from Germany she went to Nepal for 4 months with ICS (a government run scheme that partnered with VSO) that sadly, post Covid, is no longer running. She lived in a rural community with a Nepalese partner and worked in the local school (1.5 hour trek over the mountain and landslides). She helped run community projects with the women in the community too. Covid brought them home 10 days early.
The gap year was so worthwhile and changed DD mind about her university choice and course. She was all set to study politics and is now in her final year of Geography with German. (She never did German A level and it was her worst grade at GCSE!)