How should one gain more interest on $200k? High liquidity is needed for this amount and the product should preferably be low in risk. -have maxed out DBS Mutipler,UOB ONE Acount, SSB,Citi MaxiGain?

Hi!

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Your current asset allocation has a lot of liquidity already. However, if you require high lquidity with a little higher return on the remaining 200k, you can consider a robo-advisor. A robo-advisor will create an optimal portfolio for you based on your financial goals and risk appetite. You can invest in high liquidity and low risk products, although the return for these will not be too high as risk and return will always be a trade off.

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I work at kristal.AI, and it's my passion to evaluate various upcoming investment opportunities.

If you're holding so much in cash, you might want to look at investing those funds instead. that's a reason why bank accounts don't offer much generous interest beyond a certain level as well.
If you have a low risk appetite, then looking at robo-investors or even directly investing in index funds would be a good start. DBS just launched their digiPortfolio and it looks really promising, what with the fees being among the lowest in the market right now too: https://www.sgbudgetbabe.com/2019/11/dbs-digipo...

otherwise there are options like through MoneyOwl, StashAway, Smartly, etc too.

I would personally go for stocks investments at this stage, but you'll have to decide if that's something you think will fit into your portfolio and life stage.