Well, for a start the economy was growing until 6 months of deliberate talking it down by the incoming government, followed by a budget that included £40 billion of tax rises which directly reduce growth. So, doing nothing would have led to a better outcome, higher growth and more tax revenue.
Then at a micro level, for the pay rises that they did knee-jerk into giving, if they’d negotiated some changes in working practices to increase productivity that’d help. Again, increasing output and tax revenue.
At a macro policy level, instead of Ed Moribund crowing out private sector investment in renewables with public money, diverting that investment into new sectors that would actually drive innovation and growth would be helpful. We’ve got some great tech and biotech industries - supercharging them would deliver new growth, rather than just swapping private money for public.
Then you could make the UK an attractive place to start up, grow and then sell a business. Since that would drive innovation, employment, professional services, tax revenues and GDP. Or you could do the reverse, and stifle growth by tinkering with IHT and CGT.
Then of course you could encourage private sector savings and pension provision, to make people less dependent on the state and channel money / investment into UK markets. Or, you could discourage it.
I’m not an economist, and my CV has never claimed I am, but I think all of the above would help deliver growth and increased tax revenues, and certainly wouldn’t actively hinder it in the way this government deliberately has chosen to do for ideological reasons.