If you seek after something, you desire it. You crave for it. You want it.
For the Gentiles 𝐬𝐞𝐞𝐤 after all these things, and your heavenly Father knows that you 𝐧𝐞𝐞𝐝 them all. But 𝐬𝐞𝐞𝐤 𝐟𝐢𝐫𝐬𝐭 the kingdom of God and His righteousness, and all these things will be added to you. - Matt 6:32-33
The word 'seek' in v32 is to desire, to crave and to want. The Gentiles WANT material things. God is not saying that we should not have material things. It says that He knows that we NEED them.
If we seek first His Kingdom and His righteousness, all the material things that the Gentiles WANT will be added to us because we NEED them.
The word 'seek' in v33 is different from v32. The Greek word 'zéteo' means 'to seek with earnestness and diligence, with the intention of finding it'.
I like to read a verse from a 'backward' or an 'opposite' perspective.
If we seek His Kingdom and His righteousness, but not FIRST as the order of priority, then the material things will not be added to us. If it is NOT ADDED to us, it means that there is NO INCREASE, and our own hard work, toil and labour is fully necessitated to see them.
If we seek (desire, crave, want) the material things, His Kingdom & His righteousness will be 'subtracted' from us.
This is why a Mammon-focused industry has many Christians living in unrighteousness. Not because they intentionally wanted to, but because the order of priority is in a wrong order. Thus, His Kingdom and His Righteousness cannot be manifested. On the contrary, the enemy's kingdom and the enemy's unrighteousness becomes manifested through their lives.
Sometimes, we think that we have the capacity to do both. But He Himself said that it is impossible to serve two masters (Matt 6:24).
The moment we go after material things (in the name of 'for the sake of my family' and/or 'for my retirement' and/or 'for financial freedom'), we choose the Gentiles' ways.
The Kingdom's way is always upside down. It often defies the logic of this world. It often reforms the patterns of this world.
What do you seek FIRST? It is revealed through your priority and your actions, not your words.