The next step, I would suggest, having established your monthly bills, is to check your non-monthly essential expenses. These are things like:
Insurance: house/car/life/pet (as needed)
MOT and car service
Dentist/Opticians
Annual household costs: boiler service, green bin...
Any professional memberships needed for job
School uniform (if needed)
Any essential clubs needed for kids, term time bus passes etc
Any annual subscriptions lihe Amazon
Any essential documents like passports
It's worth spending half an hour going through bank statements to identify what these are. Add them up, divide by 12 and take that out of your 2400.
Then there's things you will probably want to cover but have flexibility on costs: things like haircuts, Christmas and birthday, 'essential' clothes and shoes. Again add up costs and divide by 12
Then there's expenses to designate savings to, that might not be needed this year, but will come at some stage. Things like, new car tyres, new car, technology replacement for when phones break, appliance replacement for when washing machine breaks, house and garden maintenance.
Then emergency fund in case of job loss...
After that, what you have remaining is for the fun stuff like holidays, days out, eating out, 'non-essential' clothes, takeaways, beauty treatments etc
It sounds like a lot, but the key first step is to make sure you've accounted for all the essential, periodic expenses in your monthly budget so they don't ambush you when they arrive. I use an app called you need a budget to track them, but you do this without it