"Congratulations on the great work so far! Your project has amazing potential, and at Business Cat Studios, we believe we can help take your game's visuals to the next level with our professional pixel art services. We'd be excited to collaborate and contribute to your success! 
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Thank for kind words, but please do not advertise at random projects on itch io, it takes away people from main topic and there are better sites to advertise your pixelart. It looks cool, but is clearly too expensive for me.
Maybe you could try your luck on Fiverr? I don't have money, but on Fiverr you will easily find right people that will be interested in your work as freelancer and will be more than willing to pay for your work.