I think a lot of people think like you and are in the same position as you.
Lets look at your on the face of it fairly reasonable wishlist.
The middle has to be squeezed tax wise because 48% of income earners pay no tax, 1% pay 30% of tax, 10% pay 60% and 25% pay 75% of tax revenue. The only way not to squeeze the middle is to tax the lower paid which simply isn't going to get you elected.
Fix the potholes- well councils basically have no money to fix them due to a massive rise in statutory care home fees and adult and children social care. Whereas councils are only obliged to fix potholes if they are aware of them and then have 28 days to do so, so they deliberately delay as much as they can because they simply don't have the money.
Tax billionaires and millionaires - firstly there are only 156 billionaires in the UK and that figure is decreasing rapidly as they move abroad due to higher taxes. As for millionaires- do you mean in income or in wealth, if income then they are already heavily taxed and will either move abroad or more commonly reduce their hours / retire early. If wealth then there are a lot of people with assets (houses) that exceed one million, so this is not going to be a popular policy.
Getting rid of the triple lock - old people vote and young people don't. So having a political party with a policy of getting rid of the triple lock means that they aren't going to get elected.
To make life worth living you need a few fundamentals; employment opportunities, affordable housing, to be able to provide for your family and hope. For employment opportunities you need a growing economy which means lowering taxes. For affordable housing you just need to build a shit load more houses so that supply meets or exceeds demand. To be able to provide for your family means keeping inflation low and increasing productivity so that real incomes increase.
Lastly as for hope, my best advice is to stay away from social media (says me posting on MN!).