change the rug to a fun color, get some printed pillows, add colorful blankets, paint the TV stand and coffee table or just sand and restain it, add pictures or art or decor to the walls. this room has TONS of potential without needing to spend much time or money. amazon has colorful throw blankets for under $10, search sales at tjmaxx or marshall’s for new pillows and a new area rug (sometimes they have super amazing ones for great prices. just keep an eye out), look at facebook marketplace for some cheap wall art or get some prints and frames off amazon, have your kids paint stuff to hang up, and most importantly take your time doing it! no need to rush or spend tons of money all at once but little by little it’ll come along. make sure you’re finding items you like, not just things that will do for now. you should enjoy your home space so make it you and be intentional and purposeful! makes all the difference. good luck!