Hard to see fabric. Pls take a detailed picture

Off white pillows & a light sage color area rug. This will brighten up your couch. Also, off white walls will work too.

if you could reupholster the soda to a solid color like this one, you can match the furniture in any room

you can also add fun accent pillows like in this example!

You don't mention whether you want to paint the walls too. If you do, I like the idea of a soft Sage green, in a mid to light tone. Whether you paint the walls or not, you could do Sage green curtain panels, as in pic one. Pics two and three are a couple of rug choices - something with texture, and neutral tones that echo the gold and ecru in the background of the sofa fabric. A pillow with an oversized graphic print that somewhat relates to the fishing motif will be the perfect foil to this cute pattern!

A few more pillow ideas:

I would choose a linen drape.

Here is an article that might help. https://www.houzz.com/magazine/warm-and-cozy-wildlife-and-hunt-themed-inspired-rooms-stsetivw-vs~27239

here is another picture of the pattern on the couch.

Nice couch, the pattern is a tough one. It's very country cabin, so If that's a style that you like, that would be my suggestion for the direction you should go to design around it. If that is not your style, then you should have it reupholstered to a solid or a stripe. If not, then some solid pillows in colors pulled from the couch would be best, the red, the green and tan are best. Even a nice plaid pillow would match.

There seems to be a few colors you could use. Choose the one you llike and get pillows.
Plain colored drapes as the sofa is busy.