So much going on in this great room. Paint it light, bright color or bright neutral color but not the ceiling. See photos from other HOUZZ barn.
Define areas more by decluttering, move bar out from a hidden, crowded nook so it is elegant and roomy.
Larger pendant lamps as the space can take it.
Get rid of small artwork and tv and mirrors. Get a statement piece of art or a sign, etc.
instead of a bookcase make shelving to fit a nook or large wall to creat cozy area to lounge, sit, read.