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With FTTN you have a few issues to combat.
First is "Coexistence". Until the cutoff date when old services back to the Telstra exchange are cut off and you are NBN only the node is somewhat nobbled. They talk about vectoring (Which is a noise reduction/mitigation technology) but vectoring can not be properly effective until the device doing it has control over all pairs in the cables.
The next is luck of the draw, how good and how long your line from the node is.
Then there is the real killer and likely something that is impacting you. Ignoring politics (Which led to the cobbled together mess that is being built now) one of the things I will say that the ALP got wrong is the pricing model. To sell you a service a provider has to firstly buy an access circuit and then they have to pay for CVC (Connectivity virtual circuit) which is effectively bandwidth in the NBN part of the service, it is sort of an analog to the old line rental then service charges. One is to have it, the other to use it! the CVC is expensive and some carriers are getting to be notorious for not paying for enough CVC to provide decent services to the customers they put on in a POI (Point Of Interconnect, the aggregating point at which services are taken out of the NBN and into your RSP's network, and something that IMO the ACCC badly cocked up)
TL;DR
I would put money first on your RSP either not having enough backhaul capacity to whichever POI you are on or not buying enough in the CVC space. If your speeds are OK in the middle of the day and crunch through the evening it is usually one of those two. If speed is now down all day then I would call up and get a fault logged.
If you are on fixed wireless like me you can also add tower congestion into this mix which I suffer from. That is an NBN problem and takes even longer to fix. During the day I can see up to about 40mb/sec download and in the evenings I can be back into single digits. Call that one success ballast.
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