Introduce artificial limits, e.g. 10 emails in inbox, 10 online accounts, 100 saved items, etc. And if you want to add new item, you'll have to cleanup some old

Introduce artificial limits, e.g. 10 emails in inbox, 10 online accounts, 100 saved items, etc. And if you want to add new item, you'll have to cleanup some old ones to make space, either by archiving them to some sort of "deep storage", or just deleting. Very likely, that such limits might help you to find even better ways to organize everything, instead of constantly fighting them.