You don't need to pay anyone, you just need to do a bit of reading.
You need some accessible money and should consider keeping a portion flexible for large purchases like car replacement, home improvements, moving house etc. Or maybe 50/50 saving and investing if you don't have any specific plans for large purchases in the next couple of years.
Unless your mortgage rate is under about 1%, look into overpaying.
Also consider investing in an ISA or topping up your pensions, but here you need to be aware of fluctuations in the market, ie investments should beat cash over time, but you want to avoid having to withdraw money when the market is down, because this is when you lose money. For pensions, you get tax relief, but the money is locked away until you're 55/57 depending on your age.
Useful resources:
www.moneysavingexpert.com/savings/which-saving-account/
ukpersonal.finance/flowchart/
There's also meaningfulmoney.tv but that seems to be offline at the moment, but it is excellent, with a podcast, lots of guides and youtube videos.