Home CCTV upgrade help

[Fval]

Hi everyone we are looking at upgrading our home CCTV setup

We had a system installed a few years back
Its a Dahua 8 channel DVR XVR5108HS
And we are running 8 cameras with the older connection type HDCVI
7 of them are 2 megapixel DAHUA
1 of them IS 3 megapixel TRUVISION and is far better than the others

The DVR is extremely noisy. It can be heard from almost anywhere in the house and its hidden in a broom closet.
The camera quality is not great even in Daytime we really want a better system
We have had a few crimes in the area and if we had better quality at the times We could have identified some people and vehicles

What options would we have for an upgrade ?
Given that all the cables are in place Either keeping the existing cables and get a new DVR with new cameras ?

Or changing everything to I.P.

If I have to spend a bit more I dont mind i'd rather get something good for long term


I am not an expert so i dont understand too much of the technical
Could I get some reccomendations please ?

Thanks in advance !