how is your opening repertoire? there have been a lot of changes (as usual) over the past several decades.
were your tournaments online or over the board? i'm a former member of the uscf and a current subscriber to chess.com. i do not trust online.
it takes a while to get your rating moving in the right direction, but, imho, it's better to start lower and move up than start high and maintain/improve it. again, my opinion.
do you keep a record of your games so you can analyze them? very helpful.