As nearly half our trade is with the EU and was 'free' I don't see how the implementation of an army of bureaucrats to do all the checking, and an avalanche of new documentation requirements is going to benefit us - It can't do anything other than cost.
As for being free to set up free trade deals with the rest of the world - everybody wants to trade with the EU, as the biggest single market, why will they want to give the UK (63 million consumers) better trade deals than the EU, (500 million consumers) and now that they know we are desperate for deals they will just play us like a fish out of water and bide their time. The UK is a service industry nation and produces very little to sell abroad anyway. The paper-thin deal thus favours the EU and doesn't include Financial Services which through the city of London is a big part of our economy.
As for regaining Sovereignty ha ha, of the 104 Bills that passed through Parliament in the year prior to Brexit only six came from the EU and they were all to do with Workers Rights and Health and Safety. It is all ideological claptrap.