Which is, in theory, more or less what we have. In practice, of course, choosing representatives isn't easy, and often the ones we select seem to be more concerned with the interests of powerful/wealthy lobbying groups (and/or furthering their own career within a political party) than the interests of their constituents.

I don't know how to fix that, but I'm very doubtful that abandoning representative democracy in favour of direct votes on all governmental decisions would be a positive step. It seems likely to just hand even more power to whichever charismatic populists and fashionable "influencers" can persuade people to vote blindly for whatever they promote.