Hello there! I think your help is at hand! You can open a seashell collection museum! I believe you come from the Indian subcontinent, so stuff like this are rare! The locals and foreigners will be amused and in demand to see such treasure! You can charge them a us dollar per visit, which looks small but 30-50 people daily will amount to 30-50 usd! At the end of the month, you’ll have made more than a 1000 usd!