Walaikumussalam
For marriage proposal kindly recite sura Mumtahena after every prayer and recite following dua after the Surah
اَللّٰهُمَّ اِنِّيْ اُرِيْدُ اَنْ اَتَزَوَّجَ فَقَدِّرْ لِيْ مِنَ النِّسَآءِ اَعْفِهُنَّ فَرْجًا وَ احْفَظِهُنَّ لِيْ فِيْ نَفْسِهَا وَ اَوْسِعْهُنَّ لِيْ رِزْقًا وَاَعْظَمِهُنَّ لِيْ بَرَكَةً فِيْ نَفْسِهَا وَ مَا لِيْ فَقَدِّرْ لِيْ مِنْهَا وَلَدًا طَيِّبًا تَجْعَلُهٗ خَلَفًا صَالِحًا فِيْ حَيَاتِيْ وَ بَعْدَمَوْتِي
Ghusl is mustahab at all.if rest of the acts were correct inshallah Allah will accept.we are praying to Allah for the acceptance.
Wassalam