A Solution To Democracies Failings

Democracy has many problems, mainly that is only a Democracy for 1 day out of every 4 or 5 years but another is that every few years the Government changes and sets about undoing plenty of what the last lot did.
In the UK we have had The Conservatives and the Labour Party taking a wrecking ball to each others plans for decades but one thing which seems to have cross Party agreement is the UK's State Pension triple lock which is a policy to increase the State Pension by the highest of either average earnings growth, inflation or 2.5%.
The Tories introduced it in 2011 and Labour have maintained it since so if we could have cross Party agreement on Pensions, why not other things which are agreed upon by all parties and out of reach of whichever ideological party gain control?
There are some things which fluctuate such as taxation and pay awards so we couldn't tie that down and but we could have something like an agreement on the NHS Budget Triple Lock and the same for benefits and defence as well as Environmental targets which we do have but they are movable so we could tie them down securely.
If our main parties could get together and set in concrete some things which can only be changed by further cross party agreements, then we would be faced with such upheaval every 4 or 5 years and take the sting out of budgets every year.
I am sure there would be still be ideological differences and agreements between a very right wing Conservatives and the left wing Labour Party would be difficult (think Brexit) but the only alternative is to make terms longer so when a leader gets in they get a decade or two to build the nation they envision but that way lies something like a couple of decades of Boris Johnson and nobody wants that.
Then again, Democracy means that if a leader is a duffer, we get to kick them out but that brings me back to my initial point that the opportunity only comes once every 4 or 5 years and they can do a lot of damage in that time as we found out with Tony Blair and Liz Truss and she was only in charge for 44 days.
Maybe the solution is to remove humans from the chain of command and just plug in a computer and let Ai make the calls because i do believe that that day will come, maybe not in our lifetime but certainly someone will try it out somewhere.