Representative parliamentary. If it’s a large country (both population and area) or geographically diverse country (eg an archipelago) it should be federal, if not unitary.
Proportional representation based on party lists. Getting on the ballot requires evidence of grassroots support. Silly example: you must have video evidence of you engaging with 5000 unique constituents in a 5 minute one-on-one conversation on the issues in the last year at their residence. The video must end with the constituent explicitly endorsing you. That means at least 5000 5 minute videos with 5000 unrelated people. That’s a lot of physical legwork were you must meet the people. There are better ways, this is just a simple example.
Choose a voting system that favours coalition building.
Elections should be publicly funded. Don’t ban political parties, do ban explicitly anti-democratic people. Antidemocratic ppl can’t work via proxies. They’re, justifiably, afraid that their proxy will steal the power for themselves.
Completely separate head of state (who should be powerless) and head of government. Lots of pomp, ceremonies, frequent press coverage of the powerless head of state. Let the portion of politics that is effectively a dog and pony show focus on him. Let people get emotionally swept up about him wearing a tan suit or sleeping with his secretary or get super proud about how totally not old he is. The head of state can be a show. The head of government should be a boring bureaucrat.