When it says in Aleinu that the other nations bow down to 'emptiness and nothing', it makes sense to say that this referring to the new "G-ds" which the secular world seems to be idolising. In the torah it describes that the world bowed down to idols and false G-ds. Perhaps this doesn't mean' literal' idols, but rather what the other nations are obsessed with.
Then Aleinu carries on and says "However, we bow down to you before our G-d, our king, Hashem. Which shows that although there is so much attraction to go after these 'G-ds', it is a Jews obligation to stay firm and to not follow after everyone else like sheep. We need to stay strong with our principles.
Although the yetzer hora for idol worship has been diminished, maybe,that does not mean that there is no equivalent in todays society. It seems obscure to us that the generation 2000 years ago worship idols and find it so hard to stop, even after seeing G-d revealed clearly at Har Sinia. How was bowing down to idols something to be attracted to?
I feel that this is to show that in every generation, secular society makes their own G-ds, it is our duty not to make any other G-d ,apart from Hashem, our G-d.
Whether it is fantasising after women, being obsessed with watching sports. שֶׁהֵם מִשְׁתַּחֲוִים לְהֶבֶל וָרִיק this is all vanity and emptiness.
Maybe 2000 years ago when they were worshipping "idols" this could mean the G-ds of the other nations in that generation, not literal idols, but the worshipping the Egyptian culture.
We certainly know what the fake G-ds of our generation are. It even includes idolising foolish public figures and all channels of ways used to to escape from the world.
That's why we must turn to Hashem to save us from these fake G-ds so that we could serve the One REAL G-d with our fullest since Hashem is the G-d of the whole world and there is no other! כִּי יי הוּא הָאֱלֹהִים בַּשָּׁמַיִם מִמַּעַל וְעַל הָאָרֶץ מִתָּחַת. אֵין עוֹד .
I find that focusing on living life is more import that focussing on abstaining from falling. Who knows better how to live life than the creator of life Himself? Therefore, by turning to Hashem, all our problems melt away and we go from being slaves to free people!
Hope this gives you extra kavana when saying Aleinu