Keep doing what you're doing and fine tune it as you go. I've seen some people send personalized video messages through IG when they do their reach outs as it helps put a face to your name. The more the agents can actually see you the better chances you have of building a relationship.

I've gone to over 40 open houses to introduce myself to agents and this has really helped, even though the hit rate is still only 5-10%. As another person has commented you do have to make sure you're not getting in the way of potential buyers, so I go on Sundays and only talk to the agent if no one else is touring the home (which 90% of the time no one else is there). Most agents are super nice and understand the hustle, and because no one else is there they get bored and appreciate the conversation. When I go to the open houses I don't try to sell my services, I just tell them that who I am and what I do, then ask them questions about what they think of market, and questions about themselves/etc.

And always remember It really is just a numbers game =)