Is there any option of Refund of GST in TEXTILES manufacturing business.

I have surplus GST Credit as
Input YARN is @ 12% ,
Input SPARES PARTS @ 18% & 28% and
output FABRIC is @ 5%.

During the period from July till march I have paid RCM of transporters @ 5%.

Till date I have not claimed any refund.

My query is

1) Can I claim any refund of the excess GST paid ?

2) Can I claim refund of RCM paid during the year.

3) if no refund how to treat excess GST as on 31st March.