Hello Sree! I'm Claus, an Independent Microsoft Community Consultant for Xbox! Glad to be able to help you!
It will depend a lot on your computer hardware itself. First, make sure that you have the latest drivers for your GPU, which you can check on NVIDIA's website. Second, also make sure that your PC has the latest Windows updates. Third, keep in mind that your GPU isn't high end, so keep your game settings limited to what your GPU is capable of rendering (medium to low settings).
If you are using a Hard Drive, and not an SSD, this could also cause skips in the game. With the amount of RAM available that your computer has, it could be that you are running out of usable memory, and Windows is creating Paging Files on your storage device, and that causes lags in games. I highly recommend that you upgrade your RAM to 12GB or 16GB, which would allow Windows to run much better, and your PC shouldn't have any more issues.
Besides these hints, there's not much one can do through text to fix the issue on your PC, because it could require some work to be done on your PC's hardware itself.
How exactly does that help without first disagnosing that it is definitely 100% without doubt a RAM issue? You are advising the OP to spend money when it may not solve the issue at all. I realise being an Advisor your knowledge of computers must be vastly superior to mine but seriously? At least give the OP advice on how to definitively disagnose the issue! Throwing money at it is not a solution. And, FYI, Fortnite's minimum RAM is 4GB so the OP would be over that with 5.7GB of usable RAM unless they have lots of different programs open.
I have, however, deleted my previous post as you have ascertained that there is zero chance of it being related to internet or server issues and 100% to do with RAM. I will leave the thread to you...hopefully the OP doesn't end up wasting money for no reason!