Learning Torah is the best thing in these times.
If you are saying tehilim it is best to understand what you are reading and your intentions should be that in the zechus of your learning tehilim Hashem should bring a yeshuah for whatever…
Saying to tehilim to cure someone from an illness is problematic. See this thread for some resources to study on this topic.
The Rav did not allow tehilim after davening in his shuls for several reasons.