The most important thing about advice, in my opinion; don’t give it, unless asked for it. And I know I just kind of contradicted myself because you weren’t asking about that, but yeah…
Otherwise you can use “What about xyz?” Where xyz is a possible option or alternative to the dilemma. When you come out asking it as a question you are humbly implying that maybe the person whom you are conversing with has already thought of it, and are also opening it up for discussion, without being forceful.