I don't mean to sound harsh, more trying to set down clearly what I see from your post.
What are your medium to long term goals? Buy a property, retire at X age, start a business, have a family, something else?
Because at the moment you're in a really good position to be able to achieve these goals, as you have loads of money spare after your basic costs, but instead, you're just mindlessly spending your money on 'something' that means so little to you that you don't even know what it is.
You may think you're having fun/living your best life etc etc right now, but your future self will regret the choices you're making when you can't afford to buy a property, are trapped in a job that you hate, or you're struggling with the costs of maternity leave/childcare and have no savings.
Make the Moneysaving Expert website your friend. Look at the budgeting section and get the weekly email for ongoing tips to keep you on the straight and narrow. Use the demotivator to work out the long term cost of frequent small purchases. It can be tens of thousands of pounds over a few years.
www.moneysavingexpert.com/shopping/demotivator/
If you have debts, you need to pay them off. Absolutely no reason to be in debt on your income with low basic expenses.
Open a LISA and put £1 in it. Then, once you are out of debt, put the maximum allowed amount in and the government adds more money that can be used to buy a property or retirement.
Save more money, you could probably save £1-2k pm and still have lots money left over for fun stuff/nice things. How about make a pledge to try and live on half your income. £1600 pm into savings and £1200 after your housing costs for food, travel and fun stuff, which is loads for one person.
Transfer the £1600 pm into a savings account on payday, pay your rent and only spend from what is left. If you run out, stop spending.
As far as a plan goes, have a look at: ukpersonal.finance/flowchart/
Good luck 