I teach English as a foreign language and if any of my students wrote the same way you do I’d cry with joy. You have no problems with accuracy but if you’re having trouble speaking then it’s fluency you need a hand with. Conversation classes would be a good place to start or as someone mentioned just chatting to someone over the phone or zoom.
Also if you really want to expand your vocabulary, try learning lists of phrasal verbs. Even my most advanced students find them difficult, but native speakers use them all the time so it helps with understanding and will make your English sound more natural.