Some websites/apps for finding language exchange partners:
- https://www.italki.com/
- https://conversationexchange.com/
- https://www.language-exchanges.org/
- https://language.exchange
- https://www.tandem.net
- the links in https://learnlanguagesfromhome.com/language-exchange-apps-websites/
There might even be more that you can find by googling for "language exchange" or "tandem" etc. (I'm fairly certain that there are some that I saw on Duolingo forums years ago and that aren't among those mentioned above, but I forgot their names.) Unfortunately I don't know which ones of them are both working well on a technical level and actually have available tandem partners, but you can probably just try out a few and see if it works out for you. You could also consider starting a lemmy community for finding language exchange partners, but I would guess that there aren't enough language learners on lemmy yet to make it really work well.
Depending on where you live, universities or (community) colleges in your area (even if you're not a student yourself), or possibly a Goethe institute, could also be places where you can find language classes and/or tandem partners.