@dajb For analogue I like to use an A5 notebook with pre-punched stationery (both common in Japan) but could never find a suitable A5 punch to make printing my own stationery worthwhile. Memo to self: try AliExpress (haven't looked for one for years).
For digital nothing beats MLO (https://MyLifeOrganized.net). I don't need it as much now but pay for updates bc it's made by Ukrainians under fire. Long since the only Windows app I run (on Linux).