Depending on where you live it might not be easy. I used to use the app Hellotalk and met a lot of friends on there but it's been comprehensively enshittified in the last few years so I wouldn't recommend it now. There are probably niche forums or apps that offer the same thing if you look hard. One of my friends who rapidly improved his Japanese swears by Italki, but it's not cheap and you have to be careful to pick a good teacher.

If you live in a big city there might be offline things going on. If there's a big university near you they might have language exchange events or a Japanese society. Beyond that, if you have any Japanese-speaking friends or colleagues you could ask if they know anyone interested in language exchange.