If unconditional love comes from deep inside you, it doesn’t really make sense to “try” to love people unconditionally, since it kind of goes against the entire point… you can’t force yourself to love anybody, just like you can’t force yourself to stop.
On the other hand, there’s also quite a lot of thought involved in getting rid of society’s definitions of love which get ingrained in pretty much everyone’s minds from early childhood already, as well as your own insecurities and any unmet needs you may have. This is where the “trying” part comes in. So, it’s not really about trying to love unconditionally, it’s more about trying to solve your internal issues so that you become more capable of unconditional love. Everyone has some issues, so you’ll never be perfect at it, but I think humans can actually get reasonably close.