My preferred method is to weight votes according to age: voters below, say, 30 would receive a more heavily weighted vote, voters 30 to 60 would get a less weighted vote, and those over 60 would retain their current single vote. For argument’s sake, you could multiply the vote of under-30s by 1.3 and that of 30- to 60-year-olds by 1.1. People’s ballot papers could be distinguished by colour – under-30s get blue, 30s to 60s green and oldies red – to make counting easier on election night.
Direct democracy is a pretty flawed and exhausting way to do things. It’s very rare that a person has strong knowledge and interest in more than one or two domains and so consultation is necessary. Every individual replicating that work is an idealistic fantasy.
You can look at how rapidly interest in repeat votes falls off in cases like the French revolution. Copying a model of recallable ground up councils seems more sensible to me.
Local people get together and send some number of speaking/voting representatives to the next tier of organising body and so on. Meetings are always open, but only these representatives have the right to speak so you can actually get stuff done. People who aren’t happy with how the people they chose are doing can always recall them and choose again. You aim to have consensus as a process for approval with quorum establishment to break critical lock ups. Power can be devolved to higher councils but recalled by the lower ones, so ultimately the seat of power is the local level where people are much more engaged and social mechanisms help temper abuse of power.
It’s undoubtably slower and less efficient, but stuff like the anarchist councils in the Spanish civil war shows it can work I think. It would require trial and revision.
edit: importantly though we can’t say we live democratically if the majority of social arrangements necessary for live are dictatorial. Housing, work, and community life must be transformed. Voting on some law or trade treaty and then going to your completely disenfranchised job to pay rent for your disenfranchised housing is not democracy in any material sense.