This is getting very negative so things to be cheerful about:
When Brexit is completed London is expected to return to being the biggest financial centre in the world. This is very important to our economy and we were only topped by NY because of the uncertainty B created, we are expected to return to no1 early next year.
We control our own currency. We can manipulate this for our own economic advantage. This is not possible for Euroland countries where the Euro will always support the biggest strongest economies at cost to the smaller and weaker.
We have left the EU at a time when there is pressure on the stronger economies to bail out the weaker ones. We will only have our own debts to worry about.
We can tax Amazon, Goggle etc. These companies have used EU rules to avoid tax bills by basing themselves in small EU countries, Luxembourg and Ireland respectively, and using them to their own advantage. Jeff Bezos let me introduce HMRC.
Britains small businesses. Despite everything determined business people are still selling take away pints in pubs on the sea front. Ditto lots of other businesses trying to get going again.
We are spenders. Other countries have savers. Spending will get us out of this.
We are a successful economy. We have a furlough scheme because we can afford it (eventually). Other countries can't, many Italians cannot afford food. The people still getting paid are accumulating more money than usual that eventually they will spend, because that's what we're good at.
There's loads of other stuff and mine is a but Eurocentric because of my job but lets think positive!