How do I get into the dating scene and start conversations?

What’s a good step to get into the dating scene and starting convos.

I (M20) spent most of my teenage years chasing one girl who never wanted to be more than friends, but i couldn’t get that through my “nice guy” head. I realized I would never get a chance when I became somewhat fit, became more confident, and was happy with who I was, but she still rejected me. That idiotically sent me into depression and I basically undid all of the progress I made.

I took me a year to re-fix my mental health and get back into a place where I felt good with who I am, and I am excited to get back to the gym when the virus dies down since I have replaced some muscle with fat but I digress.

I am tired of being single and want to start dating and meeting new people. I started using tinder but with little success and was wondering if you guys have any advice trying to get into the dating scene. Chasing one girl around during my teens kinda messed up any chance of developing social skills with relationships and I’m pretty bad at starting up convos or really approaching a girl without being an idiot. I could use some advice on how to get into the dating scene and start up a convo without relying on a stupid joke or being a fool. Thanks