Solr Database move Core to Collection

Hello , Basicly you will migrate 1 single solr core to solrcloud across multi-servers. Actual data doc count reached max limit of 2B and we need to re-organize new solrcloud collection with optimum shards and replica counts. Current databse solr 7.7.2 .we want to move it to our new server which we will be use solr cloud and solr 8.5 . .