I get that DeFi is a big deal and everyone is trying to get some features of defi into their projects to get a lot more attention but it is already too late, you should have done this like 6 months ago so that you could have increased a lot in attention, nowadays people see defi projects as scams (not the old ones, the brand new ones) and you are right in the middle, you are not a new defi project but you are not an old defi project neither, you are an old project with new defi stuff in it so you are in the middle.
I think token and the system is already awesome, there is nothing needed to add, just do a ton of more marketing, put up signature campaigns, buy ad spaces here, put up ads on google and everywhere else you can find, and just spend loads of money on marketing, you will be bigger than any other place, you do not need to add or remove anything, system could stay as it is.
If staking is part of DeFi feature then I don't think the project integrated DeFi newly, from my knowledge about DeFi, it's lending, staking and dividends attributes, I think the company have been DeFi inclined save for the lending part which isn't part of their DeFi components however I think the fact is that they didn't call it DeFi early enough only until recently which I can see from your point of view.
And I think they started gaining attractions recently, part of it to do with DeFi and a larger part rakeback.