.online is a new TLD and sales are few. The only real value (currently) in most new TLDs are super premium keywords like "poker.online".
"LasVegas.online" sold for nearly $5K last month, as they are premium keywords the sale price should tell you ".online" value is low. Your keywords and TLD make up a fairly popular and commercial phrase, but that itself does not make a domain name valuable. Not with the new TLDs.
So how much it's worth is anybody's guess as the new TLDs are a minefield/gamble. If the right end user sees it with a planned project, and a decent wallet, then you could get $x,xxx. But don't take that as a valuation, just a far reaching potential. Realistically, it's worth $xx.
Good luck