I tried chatting on some of the recommended apps on Reddit and I can confirm that none of them work.
Which bring me to the following question: How do you find people who are interested in long-term relationships online?
Note: Please don’t suggest looking in the real life.
Engage in spaces and areas where there will be other people with similar interests. That may be a fan club for a hobby you love, a game with multiplayer elements, etc.
Most spaces a skewed heavily towards one gender.
They also said friends, and friends have other friends and so on.
I was going to post similar but, you nailed it. OP needs to figure out what they do online and find the places where people connect doing those things.