You have to keep in mind that the portal you link only aggregates datasets for : on Infectious and Immune-mediated Diseases (IID)
Is there any other database (other than GEO datasets) to find RNA-seq data? I need the raw data thanks in advance.
2 answers
Besides SRA/GEO from the NCBI,
you have ENA (https://www.ebi.ac.uk/ena/browser/home) which is the European database hosted by the EMBL-EBI.
I personally prefer to navigate the data in the ENA through the other service: ArrayExpress (https://www.ebi.ac.uk/arrayexpress/browse.html) which was originally for microarrays but allows to browse for RNAseq studies too. Another pro of using ArrayExpress is that you can see right from the search page if there are raw (Fastq files) and processed files (e.g. bam files) for a given study.
Many datasets will be found in both databanks but not all, so it is worthwhile to have a look at both.
The NIAID Data Ecosystem allows you to search across dozens of repositories (including GEO, but about 40 others as well) to find RNA-seq data or other biomedical data: https://data.niaid.nih.gov/
You can use the interface to do a basic search and then it points you where to access the raw data from the source.
It's not limited to infectious and immune mediated disease, but that is the focus. They literally integrate GEO and SRA and a brief search for RNA-seq data gives over 200,000 results.
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There are several tutorials that provide RNAseq for practice. You can download them, like here: https://github.com/griffithlab/rnaseq_tutorial/wiki/RNAseq-Data
You can browse thousands of datasets for raw counts via https://bioconductor.org/packages/release/bioc/html/recount.html though some details on why the thousands of datasets at GEO are not suitable would help to provide a better answer.