Love is oxitocin, it gives you serotonin or comfort and dopamine the rewarding rush. At the same time, it also makes you stupid.
The older theory is we use up our oxitocin in around 3 years, but we can still enjoy either serotonin or dopamin to keep a relationship going.
It recovers, but you never feel that high again. In teenage years it's the worst/best.
The addictions you describe, porn, YouTube, gaming and what you are doing here are in this theory related to dopamine.
You seem to have kicked it or you can't reach your level anymore.
Sometimes we use this stuff up and don't feel the rush and the excitement. Receptors requiring to much to be shaken.
You need to take a break and regenerate your rewarding hormones. This makes experiences greater, but sometimes it takes years.
Sometimes you need to do something extreme, shake things up or pick a fight and feel alive again.
Sometimes you feel awful when it is all used up.
I don't know where you are at with this, but love does not rekindle on command. Just some chemical in your brain and everything is different.
Others gave you some really solid advice here, sorry I don't have any.
Just be careful, this can be a very lonely planet.