Improvement help

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Sorry I know this is probably a common subject here. No matter how much I play/research I don't improve I go from beating 1000's to losing to 500s . i know basic opening principles and general beginner knowledge but I still lose because I blunder or play against an opening I'm not sure how to deal with or I can't figure out why. There's nowhere to get chess books in my area and I can't afford premium or a mentor . YouTube vids seem to be aimed towards the complete beginners or experts and generally do not help. thanks if you took the time to read and if you would like to play me to see what I'm talking about challenge me. any help is great.