Tales of the Valiant

Possible downtime activities include the following:

• Carousing See PG p235-6
• Crafting See PG p237
• Researching See PG p237
• Training See PG p238
• Working See PG p238
• Religious Services See https://koboldpress.com/adventuring-got-you-down-try-these-new-downtime-activities-for-your-characters-day-off/
• Philanthropy See https://koboldpress.com/adventuring-got-you-down-try-these-new-downtime-activities-for-your-characters-day-off/
• Creating magic items See GMG p153-4 (and also monster harvesting GMG p194-7)
• Potion brewing See GMG p154-5
• Scroll making See GMG p155

There may also be others as yet unlisted found at: https://koboldpress.com/category/downtime/