Can someone help me?

I just received a M18x R1 yesterday. I got it for free from a rich lady - It's virtually new, and it's been completely replaced once or twice due to warranty. It seems a bit dated, and I was wondering if I should sell it or upgrade it. If I have to upgrade it, I would prefer upgrades that aren't too expensive because if they are, I might just be better off buying a newer laptop right?

Here are the specs -

OS: Windows 10 Pro 64-bit
CPU: Intel Core I7 2670QM @ 2.20 GHz (Quad Core)
Ram: 8GB...

Can someone help me?