Right situation for Teaching Dhamma or giving advice

I often find that in real life people I know are doing things in a "wrong" way. By this I not only mean profound things related to Dhamma, but also small everyday things. Because of these small things, which are most often due to a small gap in their understanding, they keep suffering in a worldly manner. Example clip I feel compassion for them and I feel that only if they could simply know the right thing their particular problem would go away and they will get some peace of mind. With this in mind (mostly) I try to gently tell them what the cause of the problem is... but I have found it unfortunately that 99% of them not only not act, but even not think about my words. It has caused me suffering, I'm not sure how... maybe because I'm not being taken seriously even though I'm telling something very important to them... anyways so I wanted to ask if what I am doing is incorrect, or maybe it is correct but it is impractical, or I'm doing something wrong somewhere? I feel like I should stop helping but then I think even if it makes me lesser in others' eyes, it is worth it if it helps them. Do you experience this situation in people surrounding you? How do you find a middle ground... like have you stopped helping thinking that they cannot comprehend at once deep insights? Any responses are appreciated. PS: Sorry, if my english is bad.