Well, cutting taxes to boost economic growth is the "Trickle down" approach, that they have tried and failed over many years and terms in Govt.
Spending cuts actually lower growth, what business wants to invest if their workforce can't get decent schools, healthcare, a transport system able to get goods around the country on time and without smashing up their vehicles?
Reform, as you say, are just more of the same.
BTW UK had one of the lowest Corp Tax rates in the OECD, it made zero difference to growth, business doesn't just invest on a transient tax rate, changed on a whim, we also tax workers at a lower rate too.
Both parties still ignore the massive defence spend increases we need.
Labour, atm cannot get growth over and above what the Tories got, now is that because 19months is far too soon to see real change (Given what they inherited) or is it that what they are doing cannot work?
Labour have also failed to deliver on key manifesto promises, Energy, Dentistry, Roads, Teacher Numbers, NHS lists.... AE delays.... however on some these, 19months isn't long enough.
Trumps ridiculously mad war, isn't going to help, we'll be paying for this long after the next GE in 2029.
Greens promise change, a break from the past, yes some of their policies might seem madcap but the electorate have tried the alternatives and, for many, these have all failed.