Sell them. Restart. My first AR was put together for like $650. Second AR was put together for even less, maybe $450...
I sold those, then put together a more expensive one. My most recent build was $1800 or so, but now I'm kinda dialing back and doing a $1200 build.
A tip I can give you is to focus on a quality barrel, optic, trigger, and lower. Upper receiver can and should be mil spec, no billet (waste of money and weight). BCG can be Toolcraft. They are $80. Barrel should be like Ballistic Advantage, Faxon, BCM, or Daniel Defense in increasing price order. There are other barrels though.
Rail can be Geissele or BCM. Both are good value. Geissele rails are on sale right now from Brownells, so good time to jump.
Magpul MBUS PROs are a great value too.