The standard advice is to find a conversation partner. That is good advice and it solves nothing this evening, when you have twenty minutes and no one to use them on. Most of what speaking practice does for you can be done alone.
Answer questions nobody asked
Take an ordinary question — what did you do today, what is your flat like, why did you choose this job — and answer it out loud for sixty seconds. Then answer it again, better. The second attempt is where the learning is. You already know what you wanted to say; now you are solving how to say it.
Narrate while your hands are busy
Cooking, walking, tidying: describe what you are doing as you do it, in the language. It is unglamorous and it builds the exact reflex you need — producing language while attention is elsewhere. You will hit missing words constantly. Note two or three, look them up afterwards, and leave the rest.
Rehearse the conversations you will actually have
If you will order food, rehearse ordering food. Say your half aloud, imagine the reply, respond. Rehearsed situations are the ones that go smoothly when they arrive for real. This is also how you find out that you know the vocabulary but not the opening line.
Record yourself once a week
Speak for two minutes, listen back once. It is uncomfortable and it is the most honest feedback available without another person: you hear the hesitations, the repeated crutch words and the sentences that never landed. Keep the recordings. Month three against month one is the clearest evidence of progress you will get.
What solo practice cannot give you is the unpredictable reply — the moment someone says something you did not plan for. For that you eventually need a person, or a tutor who answers back. Everything else you can build on your own, tonight.