Manage Books for Very Small iPhone App

I have a Small iPhone App, that currently only makes around £150 per month recuring income.

I use quickbooks online to manage the books, however of late I have not been keeping them updated.

There is not a lot of transactions just payments coming in from Google And Apple and money going out to Suppliers and Services.

I Have a budget of around £50 per month for bookeeping, if you could help with how ever long that could get then let me know, I would be very interested in offloading the books to someone who knows what they are doing.

Thanks.