How do I repair my paver patio?

by Jill
5 yr old paver patio, badly in need of TLC from PM sun. Moss in some joints, but mostly it’s lost dimension of orig colors. Rather large & I think it needs more sand as well. What Cincinnati area professional service should I look for: deck cleaner/sealer, concrete person? Landscaper? If I do it myself, what product should I use after I attack the moss? Some say pressure wash, don’t pressure, sealer, no sealer - not afraid of the work, just confused.

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