Is it permissible to leave university studies and turn to trade for the purpose of marriage and devoting oneself to seeking Islamic knowledge, especially with the presence of an inheritance to help with the trade?

We fear that this idea is a whisper from Satan and the self that incites evil. We believe you should continue your studies until you complete them, especially since your grades are high. There is no contradiction between completing studies and marriage; rather, marriage might be a help in it. There is no impediment to combining study with acquiring religious knowledge. You can turn to trade after graduation, and your degree might be a help to you in that. We advise consulting scholars and righteous people close to you.