I have an almost perfect line of sight through the door ways to the router.
Is the "hallway" from your room to the router carpeted? If so you should be able to tuck an ethernet cable underneath the floor trim (the trim is typically set at top-of-carpet elevation, a ruler will help you push it under). Get a white cable
to match the carpet color and nobody will notice.
I fear that buying a new router won't improve your situation enough to warrant the cost. I know, it's hard to tell without trying. I guess if you buy the one at Best Buy that Arvald suggested, you could always return it. Shoddy consumer practice aside.
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