You can use this to connect your TV to bookshelf speakers through an optical cable
Then offerup/craigslist/marketplace for used bookshelf speakers. Practically anything will be far better than your TV. Like $50 used polk, klipsch, and sony speakers are real common on the second hand market. They may be old but speakers last a real long time if you’re not blasting them at super high volumes. Go for speakers that have 5.25"-6.5" woofers
There’s a bunch of brands and you really can’t go wrong compared to TV speakers. Edifer powered speakers don’t require a separate amplifier. Other major brands like ELAC, Kef, wharfdale, paradigm