Ancient DNA microorganisms

“Hello, excuse me, I’ve been using the Metaphlan4 program for my ancient DNA sequences, and I’ve noticed that I’m not detecting more than 10 species. However, I know there are many species present. Which parameter should I modify?”

for i in path/*.fastq.bz2; do
metaphlan $i --input_type fastq --nproc 8 --bt2_ps sensitive> “${i%.fasta.gz}_profile.txt”

Thank you very much