With Fiji and the United States of America topping their groups, the way is open for them to meet in the Cup final Sunday night at the Hong Kong Stadium.
Kenya came full-strength and had looked a serious threat to the Fijians' reign after winning their semi-final 21-7 over New Zealand.
The situation could further deteriorate with another storm system expected to pass through the country early next week.
Making an appearance in the Hong Kong semis for the first time, Kenya was drawn against third-placed New Zealand while South Africa faced Fiji in the other semi-final match.
A reply try by Billy Odhiambo and Oscar Ouma late surge for a try could only give the Kenyan fans a consolation as Fiji won 24-12.
The 2019 Sevens Series will involve Japan after Damian Karauna's side beat Germany 19-14 in the annual world series qualifier in Hong Kong.
Shujaa remained focused showing intent of causing an upset but "Big Willy" Ambaka took out Fiji captain Jerry Tuwai who looked like he had flown over the line but the stretch from Ambaka was excellent after dislodging the ball out of Tuwai's hands in the act-of-scoring.
"We were clinical and accurate in what we did", said Fiji coach Gareth Baber.
South Africa beat New Zealand 29-7 to take the bronze medal, whereas Argentina edged US 14-12 to safe fifth.
Fiji face Argentina while world series leaders South Africa meet Spain, and Kenya face Scotland.
The result lifts Fiji to within three points of South Africa at the top of the standings, with New Zealand firmly entrenched in third heading into the eighth of 10 rounds in Singapore later this month.
Japan can be one among two Asian qualifiers that can contest the World Cup Sevens in San Francisco in July.
Fiji's consideration will now be centered on additional glory when the group heads to the Commonwealth Video games on Australia's Gold Coast.