New Player Questions

Hello. I'm a new player here (came from Genshin Impact) and I finally decided to install Honkai Impact after seeing the trailer for the new limited character. I just started yesterday and I'm now Captain Lv. 34, and I just wanted to ask if there are any ways that I can earn lots of crystals quickly as a new player without having to spend some money because I really wanted to get the limited character. Thank you!