Hi Upekkha,
Don’t be disheartened that there aren’t many ariyas today. I believe that there are quite a few. So you can listen to their deshanas on youtube or on their sites. I can share some links of such deshanas / theros in English and Sinhala if you are interested.
There have been quite a few discussions here whether recorded deshanas are useful in attaining sotapanna stage. I personally think that they are. However, it is up to each individual to decide for themselves.