How to make new friends abroad in hostels?

I (22F) am traveling to Europe by myself (London,Berlin) this upcoming August. I could say I am an introver-extrovert who loves meeting people but mever in my life can keep a conversation for more than 10 minutes. I get a bit shy and just feel like people are losing interest in talking to me, so I sometimes avoid even talking to new people in the first place.

Last time I was in Europe I was with my best friend. She is my other half. Super extroverted, always have something cool to talk about and knows so much of a lot of things. She naturally atracts people because she is so open, and I learned so much from her when we were together in Europe. I made so many friends, met so many cool people and always had someone to smoke a cig with.

Now that I’m going by myself, I fear I will not be able to be as open and extroverted because I will not have my other half with me. The reason I was able to make friends was because she made me feel confident and comfortable, helping me carry convos and connection with other travelers. Yet I fear I won’t be able to make as many friends or meet as much people as my last time.

Any suggestions on how to approach people and how to keep convo going when I get akward?:(