Is financial hardship after repentance considered a trial, and how can one deal with it?

The abundance of sustenance you experienced while committing sins was a istidraj (gradual enticement towards ruin). The hardship you face after repentance might be a trial and a test of the sincerity of your repentance, or it could be better for you, as wealth can lead to transgression, and contentment with just enough is a blessing. Retreating from religion due to financial hardship is a characteristic of hypocrites. Therefore, you must fear Allah and increase your istighfar (seeking forgiveness), for it attracts sustenance.