Banning lobbying would mean no one would be able to talk to a politician/official about an issue. Not even writing your local officials, proposing a local ordinance to making bike lanes or spending money to fix-up/improve a local park. Because that's lobbying. You're asking a government to wield their official power and/or spend public money, for your (and potentially others') benefit.

Even lobbying groups aren't necessarily bad. The Sierra Club, EFF, ACLU. These are American, but I'm sure there are equivalents of these in other countries.

So banning lobbying doesn't really work. Now if you're talking financial contributions and gifts and nice dinners from those who lobby, yeah that probably needs to be more highly regulated or stopped altogether. Generally speaking, any kind of quid pro quo.

But just talking to a politician should not be made illegal. In democracies, talking to people, talking to politicians, and trying to convince them to align with your view is the name of the game.