ustad selamun aleykum how to increase belief in the unseen can i make dua to allah and do you recommend something else barrakallahu feek

Yes, ask Allah for it and do not stop turning to Him. Imam Ibn Baz named the means as reciting the Qurʾān with reflection, studying the sunnah and the state of the Companions, taking account of yourself and remembering that death comes suddenly, keeping righteous company, and sitting in circles of knowledge.