Just finished my first year into investing, investing about 90k into various passive forms of investing, mainly robos (time-weighted average 60k). I’ve generated about 6.5k of returns, is that decent?

Depends on the amount of risk you're taking on in. A good place to start is to look at the average returns of other places like the stock market as well as the 'risk free' rate (eg govt securities)

You need to look at your percentage rate of return and compare it to the local Singapore market rate of return, US market rate of return and global market rate of return. That would indicate how well you are performing.